1684, from L.L. psoriasis "mange, scurvy," from Gk. psoriasis "being itchy," from psorian "to have the itch," from psora "itch," related to psen "to rub."
Main Entry: pso·ra Pronunciation: 'sO-r& Function: noun :PSORIASIS
Main Entry: pso·ri·a·sis Pronunciation: s&-'rI-&-s&s Function: noun Inflected Form: pluralpso·ri·a·ses/-"sEz/ : a chronic skin disease characterized by circumscribed red patches covered with white scales
psoriasis pso·ri·a·sis (sə-rī'ə-sĭs) n. A noncontagious inflammatory skin disease characterized by recurring reddish patches covered with silvery scales.