psoriasis Meaning, Definition & Usage

  1. 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

WordNet

Pso*ri"a*sis noun
Etymology
NL., fr. Gr. , fr. psora.
Definitions
  1. (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.

Webster 1913