Bivalvia, class Bivalvia, Lamellibranchia, class Lamellibranchia, class Pelecypoda

(noun) oysters; clams; scallops; mussels

Source: WordNet® 3.1

La*mel`li*bran"chi*a, La*mel`li*bran`chi*a"ta, n. pl. Etym: [NL. See lamella, and Branchia, Branchiate.] (Zoöl.)

Definition: A class of Mollusca including all those that have bivalve shells, as the clams, oysters, mussels, etc.

Note: They usually have two (rarely but one) flat, lamelliform gills on each side of the body. They have an imperfectly developed head, concealed within the shell, whence they are called Acephala. Called also Conchifera, and Pelecypoda. See Bivalve.

Source: Webster’s Unabridged Dictionary 1913 Edition


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