Webster's English Dictionary

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lamellibranch

la.mel.li.branch \l*-'mel-*-.brank\ \l*-.mel-*-'bran-ke--*t\ n [NL 
   Lamellibranchia, classname, fr. lamell- + L branchia gill] - more at 
   BRANCHIA : any of a class (Lamellibranchia) of bivalve mollusks (as clams, 
   oysters,  mussels) that have the body bilaterally symmetrical, compressed, 
   and enclosed within the mantle and that build up a shell whose right and 
   left parts are connected by a hinge over the animal's back - lamellibranch 
   aj