Source : Webster's Revised Unabridged Dictionary (1913)

Lamellibranch \La*mel"li*branch\, n. (Zo["o]l.)
   One of the Lamellibranchia. Also used adjectively.

Source : WordNet®

lamellibranch
     adj : bivalve [syn: {pelecypod}, {pelecypodous}]

lamellibranch
     n : marine or freshwater mollusks having a soft body with
         platelike gills enclosed within two shells hinged
         together [syn: {bivalve}, {pelecypod}]