Psoriasis

2 definitions found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  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.


         [1913 Webster]

From WordNet (r) 2.0 [wn]:

  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