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bivalve

[bahy-valv] /ˈbaɪˌvælv/
noun
1.
Also called lamellibranch. Zoology. any mollusk, as the oyster, clam, scallop, or mussel, of the class Bivalvia, having two shells hinged together, a soft body, and lamellate gills.
adjective
2.
Botany. having two valves, as a seedcase.
3.
Zoology. having two shells, usually united by a hinge.
4.
having two similar parts hinged together.
Origin
1670-1680
1670-80; bi-1 + valve
Related forms
bivalvular
[bahy-val-vyuh-ler] /baɪˈvæl vyə lər/ (Show IPA),
adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for bi-valve

bivalve

/ˈbaɪˌvælv/
noun
1.
Also pelecypod, lamellibranch. any marine or freshwater mollusc of the class Pelecypoda (formerly Bivalvia or Lamellibranchia), having a laterally compressed body, a shell consisting of two hinged valves, and gills for respiration. The group includes clams, cockles, oysters, and mussels
adjective
2.
Also pelecypod, lamellibranch. of, relating to, or belonging to the Pelecypoda
3.
(biology) Also bivalvate (baɪˈvælveɪt). having or consisting of two valves or similar parts: a bivalve seed capsule
Derived Forms
bivalvular, adjective
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for bi-valve

bivalve

adj.

1660s in reference to mollusks with double shells; 1670s in reference to shutters or doors; from bi- + valve. The noun is 1680s in the mollusk sense.

Online Etymology Dictionary, © 2010 Douglas Harper
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bi-valve in Science
bivalve
  (bī'vālv')   
Any of various mollusks of the class Bivalvia, having a shell consisting of two halves hinged together. Clams, oysters, scallops, and mussels are bivalves. The class Bivalvia is also called Pelecypoda, and was formerly called Lamellibranchia. Compare univalve.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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