n. 牛皮癣

[医] 牛皮癣, 银屑病

[ noun ]
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
<noun.state>

Psoriasis \Pso*ri"a*sis\, n. [NL., fr. Gr. ?, fr. ? psora.]
(Med.)
(a) The state of being affected with psora. [Obs.]
(b) A cutaneous disease, characterized by imbricated silvery
scales, affecting only the superficial layers of the
skin.