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univalve

[yoo-nuh-valv] /ˈyu nəˌvælv/
adjective, Also, univalved, univalvular
[yoo-nuh-val-vyuh-ler] /ˌyu nəˈvæl vyə lər/ (Show IPA)
1.
having one valve.
2.
(of a shell) composed of a single valve or piece.
noun
3.
a univalve mollusk or its shell.
Origin
1655-1665
1655-65; uni- + valve
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for uni-valve

univalve

/ˈjuːnɪˌvælv/
adjective
1.
relating to, designating, or possessing a mollusc shell that consists of a single piece (valve)
noun
2.
a gastropod mollusc or its shell
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 uni-valve

univalve

1660s (noun and adjective), from uni- + valve.

Online Etymology Dictionary, © 2010 Douglas Harper
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uni-valve in Science
univalve
  (y'nĭ-vālv')   
A gastropod, especially one with a single shell, such as a snail, cone, whelk, abalone, or limpet. Univalves belong to the subclass Prosobranchia. Their shells are usually spiral and can hold the whole animal inside. Compare bivalve.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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