Webster's English Dictionary

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oyster

oys.ter \'o.i-st*r\ n [ME, oistre, fr. MF, fr. L ostrea, fr. Gk ostreon; 
   akin to Gk] often attrib  ostrakon shell, osteon bone - more at OSSEOUS 1a: 
   any of various marine bivalve mollusks (family Ostreidae) having a roug h 
   irregular shell closed by a single adductor muscle and including important 
   shellfish 1b: any of various mollusks resembling or related to the oysters  
   2: a small mass of muscle contained in a concavity of the pelvic bone on ea 
   ch side of the back of a fowl 3: an extremely taciturn person