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psoriasis (n.)

"chronic non-contagious skin disease characterized by dry, red patches covered with flakes," 1680s, from medical Latin psoriasis, in Late Latin "mange, scurvy," from Greek psōriasis "the itch; a being itchy," from psōrian "to have the itch," from psōra "itch, mange, scab," related to psēn "to rub" (see psilo-). Related: Psoriatic.

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Definitions of psoriasis

psoriasis (n.)
a chronic skin disease characterized by dry red patches covered with scales; occurs especially on the scalp and ears and genitalia and the skin over bony prominences;
From wordnet.princeton.edu