of, like or pertaining to oysters
Denoting the heaping up of scales seen in psoriasis, which resembles the stratification of oyster shells. ... Origin: Ostraeacea, group including the oysters ... (05 Mar 2000) ... 
Type: Term Pronunciation: os-trā′shŭs Definitions: 1. Denoting the heaping up of scales seen in psoriasis, which resembles the stratification of oyster shells.