Pelecypoda \Pel`e*cyp"o*da\, n. pl. [NL., fr. Gr. pe`lekys a hatchet + -poda.]

(Zool.) Same as Lamellibranchia. [1913 Webster]

Source: The Collaborative International Dictionary of English v.0.48
 

Lamellibranchia \La*mel`li*bran"chi*a\, Lamellibranchiata \La*mel`li*bran`chi*a"ta\, n. pl. [NL. See lamella, and Branchia, Branchiate.]

(Zool.) An earlier name for the class of Mollusca including all those that have bivalve shells, as the clams, oysters, mussels, etc., now called Pelecypoda or Bivalvia. [1913 Webster +PJC]

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. [1913 Webster]

Source: The Collaborative International Dictionary of English v.0.48
 

Lamellibranchia \La*mel`li*bran"chi*a\, Lamellibranchiata \La*mel`li*bran`chi*a"ta\, n. pl. [NL. See lamella, and Branchia, Branchiate.]

(Zo["o]l.) 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 Revised Unabridged Dictionary (1913)
 

Pelecypoda \Pel`e*cyp"o*da\, n. pl. [NL., fr. Gr. ? a hatchet + -poda.]

(Zo["o]l.) Same as Lamellibranchia.

Source: Webster's Revised Unabridged Dictionary (1913)