Definition of psoriasis noun from the Oxford Advanced Learner's Dictionary

 

psoriasis

 noun
noun
BrE BrE//səˈraɪəsɪs//
 
; NAmE NAmE//səˈraɪəsɪs//
 
[uncountable](medical)
 
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a skin disease that causes rough red areas where the skin comes off in small pieces Word Origin late 17th cent.: modern Latin, from Greek psōriasis, from psōrian ‘have an itch’, from psōra ‘itch’.
See the Oxford Advanced American Dictionary entry: psoriasis