The Britannica Dictionary
mobile search
Home
Ask the Editor
Word of the Day
Quizzes
Core Vocabulary
Browse the Dictionary
×
Britannica Homepage
Ask the Editor
Word of the Day
Quizzes
Core Vocabulary
Browse the Dictionary
The Britannica Dictionary
psoriasis
1 ENTRIES FOUND:
psoriasis
(noun)
psoriasis
/sə
ˈ
rajəsəs/
noun
psoriasis
/sə
ˈ
rajəsəs/
noun
Britannica Dictionary definition of PSORIASIS
[
noncount
]
medical
:
a skin disease that causes areas of your skin to become red and rough and to fall off
ASK THE EDITOR
What are the plural forms of
check-in
,
passerby
, and
spoonful
?
See the answer »
QUIZZES
Vocabulary Quiz
Test your word power
Take the Quiz »
Name That Thing
Take our visual quiz
Test Your Knowledge »
WORD OF THE DAY
contagious
:
able to be passed from one person or animal to another
Learn More »
