psoriasis
UK[səˈraɪəsɪs]US[səˈraɪəsɪs]
n
a skin disease that causes red, itchy, scaly patches, most commonly on the knees, elbows, trunk, and scalp.
Etymology
the term psoriasis entered english directly from medical latin, which borrowed it from the ancient greek 'psōriasis', derived from 'psōra', meaning "itch". the greek 'psōra' itself can be traced back to the proto-indo-european root bʰes-, meaning "to rub". this etymological journey illustrates a clear semantic link: from the general action of rubbing, to the specific sensation of itching, and finally to the medical name for a chronic condition characterized by itchy, scaling skin. the word has retained its specialized medical meaning since its adoption into english, precisely denoting this particular dermatological disease.
Analysis
the word is a direct loan from greek and is not productively segmented using modern english spelling substrings. its greek components are ψωρίασις (psōriasis), from ψώρα (psōra, meaning "itch") and the noun-forming suffix -σις (-sis, indicating a state or condition).
Examples
the dermatologist prescribed a new topical cream to manage her psoriasis.
psoriasis is an autoimmune condition that can flare up during periods of stress.
while there is no cure for psoriasis, various treatments can effectively control the symptoms.