1850–55; < Neo-Latin Lamellibranchia group name. See lamelli-, -branchia Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
lamellibranch (ləˈmɛlɪˌbræŋk)
n, —adj
bivalve another word for bivalve
[C19: from New Latin lamellibranchia plate-gilled (animals); see lamella, branchia]
adj, —n

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American Heritage
Science Dictionary
lamellibranch   (lə-měl'ə-brānk')  Pronunciation Key 
  1. Any of the bivalve mollusks of the subclass Lamellibranchia, the largest group of bivalves. Lamellibranchs have gills that consist of long, folded filaments with cilia at the end that draw in water for respiration and also filter food particles. Lamellibranchs include clams, scallops, and oysters.

  2. In former classifications, any bivalve mollusk.

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