The Collaborative International Dictionary
Ostreaceous
Ostreaceous \Os`tre*a"ceous\, a. [L. ostrea an oyster. See Oyster.] (Zo["o]l.) Of or pertaining to an oyster, or to a shell; shelly.
The crustaceous or ostreaceous body.
--Cudworth.
Wiktionary
ostreaceous
a. (context zoology English) Of or pertaining to an oyster, or to a shell.