laryngeal consonant

…direct evidence for the “laryngeal” consonants reconstructed for Proto-Indo-European on purely internal grounds by linguist Ferdinand de Saussure in 1879. Study of the details of the development of these guttural (or pharyngeal) fricatives in Anatolian continues.

…consonants, for which the label laryngeal is used. These consonants, however, have mostly disappeared or have become identical with other sounds in the recorded Indo-European languages, so that their former existence has had to be deduced mainly from their effects on neighbouring sounds. Hence, the laryngeal sounds were not suspected…

…ʾ) are pronounced in the larynx. The latter sound is formed by cutting off the airstream through the shutting of the vocal cords, as in the middle of the exclamation uh-oh! or in the Cockney English pronunciation of “bottle” as boʾl. A gagginglike constriction of the pharynx produces the rasping…