The Collaborative International Dictionary
Ostracean
Ostracean \Os*tra"cean\, n. [L. ostrea an oyster. See Oyster.] (Zo["o]l.) Any one of a family of bivalves, of which the oyster is the type.
Wiktionary
ostracean
n. (context zoology English) Any of a family of bivalves of which the oyster is the type.