univalve

univalve

[yoo-nuh-valv]
adjective Also, univalved, univalvular [yoo-nuh-val-vyuh-ler] .
1.
having one valve.
2.
(of a shell) composed of a single valve or piece.
noun
3.
a univalve mollusk or its shell.

Origin:
1655–65; uni- + valve

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Collins
World English Dictionary
univalve (ˈjuːnɪˌvælv)
 
adj
1.  relating to, designating, or possessing a mollusc shell that consists of a single piece (valve)
 
n
2.  a gastropod mollusc or its shell

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
univalve   (y'nĭ-vālv')  Pronunciation Key 
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
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