Ostracea

1 definition found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  Ostracea \Os*tra"ce*a\, n. pl. [NL., fr. Gr. 'o`strakon shell of
     a testacean.] (Zool.)
     A division of bivalve mollusks including the oysters and
     allied shells.
     [1913 Webster]