Abū al-Qāsim al-Zahrāwī was a medieval surgeon of Andalusian Spain, whose comprehensive medical text, combining Middle Eastern and Greco-Roman classical teachings, shaped European surgical procedures until the Renaissance. Abū al-Qāsim was court physician to the Andalusian caliph ʿAbd al-Raḥmān III

Abū al-Wafāʾ was a distinguished Muslim astronomer and mathematician, who made important contributions to the development of trigonometry. Abū al-Wafāʾ worked in a private observatory in Baghdad, where he made observations to determine, among other astronomical parameters, the obliquity of the

Ávila, city, capital of Ávila provincia (province), in the Castile-León comunidad autónoma (autonomous community), central Spain. The city of Ávila is situated on the Adaja River at 3,715 feet (1,132 metres) above sea level and is surrounded by the lofty Sierra de Gredos (south) and the Sierra de

Judaism: The making of the Zohar (c. 1260–1492): …was the visionary and adventurer Abraham ben Samuel Abulafia (born 1240), justified itself by appeal to inner “prophetic” experiences encouraged by training methods akin to those of Yoga, Byzantine Hesychasm (mystical, quietist monasticism), and Sufism. Moreover, an important place was given to speculations on the letters and vocalic signs of…

Abū al-Fidāʾ was an Ayyūbid dynasty historian and geographer who became a local sultan under the Mamlūk empire. Abū al-Fidāʾ was a descendant of Ayyūb, the father of Saladin, founder of the Ayyūbid dynasty that had been supplanted by the Mamlūks in Egypt and elsewhere before his birth. In 1285 he

Johann Jakob Reiske: …literature whose commentary to his Abulfedae Annales Moslemici, 5 vol. (1754; “Abulfeda Muslim Annals”), laid the foundation for Arabic historical scholarship.

Abū al-Ghāzī Bahādur was a khan (ruler) of Khiva and one of the most prominent historians in Chagatai Turkish literature. The son of ʿArab Muḥammad Khan, Abū al-Ghāzī spent most of his early life in Urgench. When his father died and a dynastic struggle arose among Abū al-Ghāzī and his brothers for

Ibn Zuhr was one of medieval Islam’s foremost thinkers and the greatest medical clinician of the western caliphate. An intensely practical man, Ibn Zuhr disliked medical speculation; for that reason, he opposed the teachings of the Persian master physician Avicenna. In his Taysīr fī al-mudāwāt wa

Ethiopian Orthodox Tewahedo Church: …Ethiopian archbishop, known as the abuna (Arabic: “our father”), who was always an Egyptian Coptic monk; this created a rivalry with the native itshage (abbot general) of the strong Ethiopian monastic community. Attempts to shake Egyptian Coptic control were made from time to time, but it was not until 1929…

Abuná River, a headwater of the Amazon, east of the Cordillera Oriental of the Andes. The navigable river flows for about 200 miles (320 km) northeast through rain forests, forming Bolivia’s northern border with Brazil. It joins the Río Madeira, a tributary of the Amazon, at Manoa, Bolivia. Rubber,

Abuná River, a headwater of the Amazon, east of the Cordillera Oriental of the Andes. The navigable river flows for about 200 miles (320 km) northeast through rain forests, forming Bolivia’s northern border with Brazil. It joins the Río Madeira, a tributary of the Amazon, at Manoa, Bolivia. Rubber,

species abundance, typically, the sum total of individuals from a given species within a given area. A species is considered abundant when it has a high population relative to the size of the area it inhabits. It can also include other measures of performance for plants, animals, or other forms of

As described in my book Abundance, I believe that exponential technologies are driving us toward a world of ever-increasing abundance. Within the next 30 years, we will be able to meet and exceed the needs of every man, woman, and child. From there on out, I believe we are heading toward more of a

David Riesman: …in The Lonely Crowd, and Abundance for What? and Other Essays (1964), a collection of essays elaborating some of those issues, with particular reference to the sociological effects of the Cold War.

John Green: Green’s next book, An Abundance of Katherines (2006), was named a Printz honour book in 2007. Its main character, Colin, has dated 19 girls named Katherine, and they have all broken up with him. Confused and angry about his dating past, Colin goes on a road trip with…

chemical element: Cosmic abundances of the elements: The relative numbers of atoms of the various elements are usually described as the abundances of the elements. The chief sources of data from which information is gained about present-day abundances of the elements are observations of the chemical composition of…

isotope: Elemental and isotopic abundances: The composition of any object can be given as a set of elemental and isotopic abundances. One may speak, for example, of the composition of the ocean, the solar system, or indeed the Galaxy in terms of its respective elemental and isotopic abundances.…

Annie Dillard: The Abundance: Narrative Essays Old and New was released in 2016.

number game: Perfect numbers and Mersenne numbers: ” In an abundant number, the sum of its proper divisors (i.e., including 1 but excluding the number itself) is greater than the number; in a deficient number, the sum of its proper divisors is less than the number. A perfect number is an integer that equals the…

Lampong, people indigenous to Lampung province on the Sunda Strait in southern Sumatra, Indonesia. They speak Lampong, a Malayo-Polynesian language that has been written in a script related to the Hindu alphabet. A dependency of the Sultan of Bantam (western Java) after 1550, southern Sumatra

Ki Seto ware: …soft dull-glazed pure yellow (ayame-de, or aburage-de), fired at low heat.

Miura: Jōga Island, in Aburatsubo Bay, is linked to the mainland at Miura by a large bridge. The island and bay, together with Keikyu Aburatsubo Marine Park and local beaches, help make Miura a popular tourist and recreational centre. The city also serves as a residential suburb for the…

property law: Nuisance law and continental parallels: …development of the concept of abus de droit (“abuse of right”). The concept has been extensively used in situations where the defendant has employed his land in a given way in order to interfere with his neighbour’s land use. The paradigm case came from Colmar, France, in the middle of…

F.A. Hayek: Life and major works: There Hayek worked on his Abuse of Reason project, a wide-ranging critique of an assortment of doctrines that he lumped together under the label of “scientism,” which he defined as “the slavish imitation of the method and language of Science” by social scientists who had appropriated the methods of the…

property law: Nuisance law and continental parallels: …development of the concept of abus de droit (“abuse of right”). The concept has been extensively used in situations where the defendant has employed his land in a given way in order to interfere with his neighbour’s land use. The paradigm case came from Colmar, France, in the middle of…

George Wither: His Abuses Stript and Whipt (1613)—with its satiric treatment of lust, avarice, and pride—gave offense, and he was imprisoned for some months. In prison he wrote The Shepherd’s Hunting (1615), whose five eclogues are among his finest verse, looking back to Spenser in form. Fidelia (1615),…

Abū Ṣīr, ancient site between Al-Jīzah (Giza) and Ṣaqqārah, northern Egypt, where three 5th-dynasty (c. 2465–c. 2325 bce) kings (Sahure, Neferirkare, and Neuserre) built their pyramids. The pyramids were poorly constructed (in comparison with Egyptian monuments of similar types) and are now in a

abutilon, (genus Abutilon), genus of over 100 species of herbaceous plants and partly woody shrubs of the mallow family (Malvaceae) native to tropical and warm temperate areas. It includes several species used as houseplants and in gardens for their white to deep orange, usually nodding,

abutilon, (genus Abutilon), genus of over 100 species of herbaceous plants and partly woody shrubs of the mallow family (Malvaceae) native to tropical and warm temperate areas. It includes several species used as houseplants and in gardens for their white to deep orange, usually nodding,

abutilon: Chinese lantern, also known as flowering maple (Abutilon ×hybridum), is planted outdoors in warm regions and grown in greenhouses elsewhere. It is a fast-growing shrub with attractive hanging flowers. Another species, sometimes known as redvein flowering maple (A. pictum), is a handsome variegated-leaf shrub reaching…

velvetleaf, (Abutilon theophrasti), annual hairy plant of the mallow family (Malvaceae) native to southern Asia. The plant is cultivated in northern China for its fibre and is widely naturalized in warmer regions of North America, where it is often a serious agricultural weed. It grows 0.6–2.4

abutilon: The trailing abutilon (A. megapotamicum), often grown as a hanging plant, is noted for its nodding, yellowish orange, closed flowers.

abutilon: Another species, sometimes known as redvein flowering maple (A. pictum), is a handsome variegated-leaf shrub reaching a height of 4.5 metres (15 feet) and is grown as a houseplant. The trailing abutilon (A. megapotamicum), often grown as a hanging plant, is noted for its nodding, yellowish orange, closed flowers.

velvetleaf, (Abutilon theophrasti), annual hairy plant of the mallow family (Malvaceae) native to southern Asia. The plant is cultivated in northern China for its fibre and is widely naturalized in warmer regions of North America, where it is often a serious agricultural weed. It grows 0.6–2.4

Daura: …of western Africa relates that Bayajida (Abuyazidu), a son of the king of Baghdad, killed Sarki, the fetish snake at the town’s well, and married the reigning Daura queen. Their descendants became the seven rulers of the Hausa Bakwai (The Seven True Hausa States). Daura thus became a Hausa state…

Sophie Tucker was an American singer whose 62-year stage career included American burlesque, vaudeville, and nightclub and English music hall appearances. Born somewhere in Russia as her mother was on her way to join her father in the United States, Sophie Kalish grew up in Boston and then in

Uzbekistan: The early Uzbeks: A descendant of Genghis Khan, Abūʾl-Khayr (Abū al-Khayr) at age 17 rose to the khanship of the Uzbek confederation in Siberia in 1428. During his 40-year reign, Abūʾl-Khayr Khan intervened either against or in support of several Central Asian Timurid princes and led the Uzbek tribes southeastward to the north…

Kazakhstan: Kazakhstan to c. 1700 ce: …skills of that horde’s khan, Abū al-Khayr (1718–49), who managed to forge a temporary all-Kazakh alliance—it was less devastating. The elimination of the Dzungar threat came in the form of Chinese (Manchu) intervention; in 1757–58 the Qianlong emperor launched two major campaigns, in the course of which the Dzungars were,…

Abū al-Faḍl ʿAllāmī was a historian, military commander, secretary, and theologian to the Mughal emperor Akbar. Abū al-Faḍl ʿAllāmī studied with his father, Sheikh Mubārak Nāgawrī, a distinguished scholar, and, after teaching in his father’s school, was presented to Akbar in 1574 by the poet Fayzī,

Uzbekistan: The early Uzbeks: A descendant of Genghis Khan, Abūʾl-Khayr (Abū al-Khayr) at age 17 rose to the khanship of the Uzbek confederation in Siberia in 1428. During his 40-year reign, Abūʾl-Khayr Khan intervened either against or in support of several Central Asian Timurid princes and led the Uzbek tribes southeastward to the north…

Sanāʾī was a Persian poet, author of the first great mystical poem in the Persian language, whose verse had great influence on Persian and Muslim literature. Little is known of Sanāʾī’s early life. He was a resident of Ghazna and served for a time as poet at the court of the Ghaznavid sultans,

White Nile River, section of the Nile between Malakal, South Sudan, and Khartoum, Sudan. It is formed by the confluence of the Mountain Nile (Baḥr al-Jabal) and the Sobat River above Malakal, and it flows for about 500 miles (800 km) northeast and north past Al-Rank, Kūstī (railway bridge),

Ramla: …fortifications, and, above all, the White Mosque (Al-Jāmiʿ al-Abyaḍ). Only ruins of these remain, but the minaret of the White Mosque, the so-called White Tower, 89 feet (27 m) tall, added by the Mamlūk sultan Baybars (reigned 1260–77), still stands. During the First Crusade (1096–99), the city was captured and…

Arabic literature: Literary drama: …troupes, while the famous actor Jūrj Abyaḍ—a Christian from Syria—took his renowned troupe from Egypt to Iraq in 1926.

Abydos, prominent sacred city and one of the most important archaeological sites of ancient Egypt. The site, located in the low desert west of the Nile River near Al-Balyanā, was a necropolis for the earliest Egyptian royalty and later a pilgrimage centre for the worship of Osiris. The western

Abydos, ancient Anatolian town located just northeast of the modern Turkish town of Çanakkale on the east side of the Dardanelles (Hellespont). Probably originally a Thracian town, it was colonized about 670 bc by the Milesians. There Xerxes crossed the strait on his bridge of boats to invade

Abydos: This is the so-called Abydos list of kings. The reliefs decorating the walls of this temple are of particular delicacy and beauty. Only 26 feet (8 metres) behind the temple of Seti I is a remarkable structure known as the Osireion, which is thought to be Seti’s cenotaph. This…

Western theatre: Ancient Egypt: The Abydos passion play depicts the slaying of Osiris and his followers by his brother Seth, the enactment of which apparently resulted in many real deaths. The figure of Osiris, symbolically represented in the play, is then torn to pieces by Seth, after which his remains…

Sudan: Multiparty elections and preparations for southern independence: …alarming situation in the disputed Abyei region. Under the terms of the 2005 CPA, the region was jointly administered by northern and southern Sudanese until its final status could be determined, which, with the indefinite postponement of the Abyei referendum, was still pending. There had been scattered amounts of low-level…

James Cameron: …thriller starring Sigourney Weaver, andThe Abyss (1989), about divers who discover aquatic aliens; both films received the Oscar for best visual effects. Cameron then reteamed with Schwarzenegger on the blockbusters Terminator 2: Judgment Day (1991) and True Lies (1994); the latter also starred Jamie Lee Curtis. In 1992 Cameron…

Marguerite Yourcenar: …is L’Oeuvre au noir (1968; The Abyss), an imaginary biography of a 16th-century alchemist and scholar. Among Yourcenar’s other works are the short stories collected in Nouvelles orientales (1938; Oriental Tales), the prose poem Feux (1936; Fires), and the short novel Le Coup de grâce (1939; Eng. trans. Coup de…

ocean current: Thermohaline circulation: …to as the deep, or abyssal, ocean circulation. Measuring seawater temperature and salinity distribution is the chief method of studying the deep-flow patterns. Other properties also are examined; for example, the concentrations of oxygen, carbon-14, and such synthetically produced compounds as chlorofluorocarbons are measured to obtain resident times and spreading…

turbidite: …where they build features called abyssal cones. In addition, abyssal plains are formed by the accumulation of turbidites beyond the limits of deep-sea fans and abyssal cones in locations where there is a very large sediment supply.

submarine gap, steep-sided furrow that cuts transversely across a ridge or rise; such a passageway has a steeper slope than either of the two abyssal plains it connects. Grooves known as interplain channels exist in many submarine gaps; the sediments in these channels are continuously graded. The

abyssal hill, small, topographically well-defined submarine hill that may rise from several metres to several hundred metres above the abyssal seafloor, in water 3,000 to 6,000 metres (10,000 to 20,000 feet) deep. Typical abyssal hills have diameters of several to several hundred metres. They

abyssal plain, flat seafloor area at an abyssal depth (3,000 to 6,000 m [10,000 to 20,000 feet]), generally adjacent to a continent. These submarine surfaces vary in depth only from 10 to 100 cm per kilometre of horizontal distance. Irregular in outline but generally elongate along continental

abyssal zone, portion of the ocean deeper than about 2,000 m (6,600 feet) and shallower than about 6,000 m (20,000 feet). The zone is defined mainly by its extremely uniform environmental conditions, as reflected in the distinct life forms inhabiting it. The upper boundary between the abyssal zone

marine ecosystem: Geography, oceanography, and topography: …to 4,000 metres, and the abyssalpelagic, which encompasses the deepest parts of the oceans from 4,000 metres to the recesses of the deep-sea trenches.

eastern Africa: Abyssinia of eastern Africa: The Christians retreated into what may be called Abyssinia, an easily defensible, socially cohesive unit that included mostly Christian, Semitic-speaking peoples in a territory comprising most of Eritrea, Tigray, and Gonder and parts of Gojam, Shewa, and Welo. For the next two…

Amhara, people of the Ethiopian central highlands. The Amhara are one of the two largest ethnolinguistic groups in Ethiopia (the other group being the Oromo). They constitute more than one-fourth of the country’s population. The Amharic language is an Afro-Asiatic language belonging to the

Abyssinian, breed of domestic cat, probably of Egyptian origin, that has been considered to approximate the sacred cat of ancient Egypt more closely than any other living cat. The Abyssinian is a lithe cat with relatively slender legs and a long, tapering tail. The short, finely textured coat is

Adam Clayton Powell, Jr.: …of the pastor of the Abyssinian Baptist Church in Harlem, New York City. Brought up in a middle-class home, he received his B.A. from Colgate University (Hamilton, N.Y.) in 1930 and his M.A. from Columbia University in 1932. He succeeded his father as pastor of the Abyssinian Baptist Church in…

colobus: …the Abyssinian colobus, or mantled guereza (C. guereza), of the East African mountains, including Mount Kenya and Kilimanjaro. This colobus has a long beautiful veil of white hair along each flank and a long white brush on the tail. The pelts are valued by native populations as ornaments, and at…

colobus: …the Abyssinian colobus, or mantled guereza (C. guereza), of the East African mountains, including Mount Kenya and Kilimanjaro. This colobus has a long beautiful veil of white hair along each flank and a long white brush on the tail. The pelts are valued by native populations as ornaments, and at…

shrike: …bright red below are the black-headed, or Abyssinian, gonolek (L. erythrogaster) and the Barbary shrike (L. barbarus).

ibex: pyrenaica) and the walia, or Abyssinian ibex (C. walie), which has been reduced to a single population of about 400 individuals in Ethiopia and whose numbers are still declining. Two subspecies of Spanish ibex are now extinct (C. pyrenaica pyrenaica, which lived in the Pyrenees, and C. pyrenaica lusitanica, which…

wolf: Other wolves: The Ethiopian wolf (C. simensis) looks similar to the coyote. It lives in a few isolated areas of grassland and heath scrub at high elevations in Ethiopia. Although it lives in packs, the wolves hunt alone for rodents and other small mammals. Studies estimate that fewer…

scorpaeniform: Annotated classification: Family Abyssocottidae Postcleithra reduced or absent; pelvic fin with 1 spine and 2–4 soft rays; vertebrae 30–37. Freshwater, Siberia. 6 genera with 22 species. Family Hemitripteridae Marine. Northwestern Atlantic and North Pacific. 3 genera with 8 species. Assorted References

Ea, Mesopotamian god of water and a member of the triad of deities completed by Anu (Sumerian: An) and Enlil. Ea is considered a member of the special class of Mesopotamian gods called the Anunnaki. From a local deity worshiped in the city of Eridu, Ea evolved into a major god, Lord of Apsu (also

Bella Abzug was a U.S. congresswoman (1971–77) and lawyer who founded several liberal political organizations for women and was a prominent opponent of the Vietnam War and a supporter of equal rights for women. The daughter of Russian-Jewish émigrés, Bella Savitsky attended Hunter College (B.A.,

actinium (Ac), radioactive chemical element, in Group 3 (IIIb) of the periodic table, atomic number 89. Actinium was discovered (1899) by French chemist André-Louis Debierne in pitchblende residues left after French physicists Pierre and Marie Curie had extracted radium from them, and it was also

alternating current, flow of electric charge that periodically reverses. It starts, say, from zero, grows to a maximum, decreases to zero, reverses, reaches a maximum in the opposite direction, returns again to the original value, and repeats this cycle indefinitely. The interval of time between

AC Milan, Italian professional football (soccer) club based in Milan. AC Milan is nicknamed the Rossoneri (“Red and Blacks”) because of the team’s distinctive red-and-black striped jerseys. The winner of 18 Serie A (Italy’s top football division) league championships, the club is also one of the

transformer, device that transfers electric energy from one alternating-current circuit to one or more other circuits, either increasing (stepping up) or reducing (stepping down) the voltage. Transformers are employed for widely varying purposes; e.g., to reduce the voltage of conventional power

chemical analysis: AC voltametry: During AC voltammetry an alternating potential is added to the DC potential ramp used for LSV. Only the AC portion of the total current is measured and plotted as a function of the DC potential portion of the potential ramp. Because flow of an…

AC/DC, Australian heavy metal band whose theatrical high-energy shows placed them among the most popular stadium performers of the 1980s. The principal members were Angus Young (b. March 31, 1955, Glasgow, Scotland), Malcolm Young (b. January 6, 1953, Glasgow—d. November 18, 2017, Sydney,

Australia: Transportation and telecommunications: …on telecommunications providers, and the Australian Communications Authority (ACA), established in 1999, which licenses carriers and reports to the minister for communications. With the opening of competition, by the early 21st century there were some 70 ACA-licensed providers.

Blueshirt, popular name for a member of the Army Comrades Association (ACA), who wore blue shirts in imitation of the European fascist movements that had adopted coloured shirts as their uniforms. Initially composed of former soldiers in the Irish Free State Army, the ACA was founded in response to

Joseph Acaba is an American astronaut who, over three spaceflights to the International Space Station (ISS), has spent 306 days in space. He is part of the Artemis team of astronauts who are eligible to fly to the Moon in the mid-2020s. Timeline of Joseph Acaba’s life Acaba received a bachelor’s

Joseph Acaba is an American astronaut who, over three spaceflights to the International Space Station (ISS), has spent 306 days in space. He is part of the Artemis team of astronauts who are eligible to fly to the Moon in the mid-2020s. Timeline of Joseph Acaba’s life Acaba received a bachelor’s

acacia, (genus Acacia), genus of about 160 species of trees and shrubs in the pea family (Fabaceae). Acacias are native to tropical and subtropical regions of the world, particularly Australia (where they are called wattles) and Africa, where they are well-known landmarks on the veld and savanna.

acacia, (genus Acacia), genus of about 160 species of trees and shrubs in the pea family (Fabaceae). Acacias are native to tropical and subtropical regions of the world, particularly Australia (where they are called wattles) and Africa, where they are well-known landmarks on the veld and savanna.

Africa: Botanical resources: The Albida acacia tree of the “farmed parkland” areas of western Africa is of special economic importance. Unlike almost all other dry woodland trees, whose leaf shedding normally occurs at the onset of the dry season, the Albida appears to have a period of partial dormancy…

Bagheera kiplingi: …stinging ants of the genus Pseudomyrmex, which live inside the swollen thorns of the trees. Pseudomyrmex ants have a well-characterized mutualistic relationship with swollen-thorn acacias; the plants depend on the aggressive nature of Pseudomyrmex to protect against animal predators, and the ants depend on the trees’ Beltian bodies and nectar…

acacia: Major species: The babul tree (Vachellia nilotica, formerly A. arabica), of tropical Africa and across Asia, yields both an inferior type of gum arabic and a tannin that is extensively used in India. Sweet acacia (V. farnesiana, formerly A. farnesiana) is native to the southwestern United States.

Nepal: Plant life: These forests consist mainly of khair (Acacia catechu), a spring tree with yellow flowers and flat pods; sissoo (Dalbergia sissoo), an East Indian tree yielding dark brown durable timber; and sal (Shorea robusta), an East Indian timber tree with foliage providing food for lac insects (which deposit lac, a resinous…

angiosperm: Contribution to food chain: …petioles of bull’s-horn thorn (Acacia collinsii; Fabaceae). Ants live inside the hollow modified spinous structures of bull’s-horn thorn and feed on the nectar. In return for this food source, they attack and destroy animals of all sizes as well as other plants that contact the acacia plant. In doing…

acacia: Major species: decurrens), and the silver wattle (A. dealbata). A few species produce valuable timber, among them the Australian blackwood (A. melanoxylon); the yarran (A. omalophylla), also of Australia; and A. koa of Hawaii. Many of the Australian acacia species have been widely introduced elsewhere as cultivated small trees valued…

acacia: Major species: pycnantha), the green wattle (A. decurrens), and the silver wattle (A. dealbata). A few species produce valuable timber, among them the Australian blackwood (A. melanoxylon); the yarran (A. omalophylla), also of Australia; and A. koa of Hawaii. Many of the Australian acacia species have been widely introduced…

acacia: Major species: Sweet acacia (V. farnesiana, formerly A. farnesiana) is native to the southwestern United States.

gum arabic, dried water-soluble exudate that comes primarily from two species of acacia in sub-Saharan Africa, Acacia senegal and A. seyal, and that has numerous applications, particularly in the food industry and in areas such as ceramics, painting, photography, and printmaking. Humans have in

acacia: Major species: melanoxylon); the yarran (A. omalophylla), also of Australia; and A. koa of Hawaii. Many of the Australian acacia species have been widely introduced elsewhere as cultivated small trees valued for their spectacular floral displays.

conservation: Secondary extinctions: …mainly on large koa (Acacia koa) trees (see acacia). Today, however, few koa forests remain, because the trees have been overharvested for their attractive wood. Yet another Hawaiian honeycreeper, a seed-eating species called the palila (Loxioides bailleui), is endangered because it depends almost exclusively on the seeds of one…

acacia: Major species: …valuable timber, among them the Australian blackwood (A. melanoxylon); the yarran (A. omalophylla), also of Australia; and A. koa of Hawaii. Many of the Australian acacia species have been widely introduced elsewhere as cultivated small trees valued for their spectacular floral displays.

grassland: Biota: …invaded by the African shrub Acacia nilotica, introduced by humans.

acacia: Major species: …of tannin, among them the golden wattle (A. pycnantha), the green wattle (A. decurrens), and the silver wattle (A. dealbata). A few species produce valuable timber, among them the Australian blackwood (A. melanoxylon); the yarran (A. omalophylla), also of Australia; and A. koa of Hawaii. Many of the

acacia: Major species: Gum acacia (Acacia senegal), native to the Sudan region in Africa, yields true gum arabic, a substance used in adhesives, pharmaceuticals, inks, confections, and other products. The bark of most acacias is rich in tannin, which is used in tanning and in dyes, inks, pharmaceuticals, and other…

Acacian Schism, (484–519), in Christian history, split between the patriarchate of Constantinople and the Roman see, caused by an edict by Byzantine patriarch Acacius that was deemed inadmissible by Pope Felix III. With the support of the Byzantine emperor Zeno, Acacius in 482 drew up an edict, the

Homoean: …Christian Church, a follower of Acacius, bishop of Caesarea. The Homoeans taught a form of Arianism that asserted that the Son was distinct from, but like (Greek homoios), the Father, as opposed to the Nicene Creed, which stated that the Son is “of one substance” (Greek homoousios) with the Father.

Saint Felix III: Felix excommunicated Acacius, patriarch of Constantinople, in 484 for publishing with the emperor Zeno a document called the Henotikon, which appeared to favour Monophysitism, a doctrine that had been denounced at the Council of Chalcedon (451). The excommunication created the 35-year Acacian Schism. Felix’ Lateran Council of…