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From The Collaborative International Dictionary of English v.0.44 [gcide]:
Univalve \U"ni*valve\, Univalved \U"ni*valved\, adjective [Cf. F. univalve.] (Bot. & Zo["o]l.) Having one valve; as, a univalve shell or pericarp.
From The Collaborative International Dictionary of English v.0.44 [gcide]:
Univalve \U"ni*valve\, noun [Uni- + valve: cf. F. univalve.] (Zo["o]l.) A shell consisting of one valve only; a mollusk whose shell is composed of a single piece, as the snails and conchs.
Note: Most univalves are spiral and are the shells of gastropods, but many belong to cephalopods and pteropods. A large number of univalves belonging to the gastropods are conical, cup-shaped, or shieldlike, as the limpets.
From WordNet (r) 2.0 [wn]:
univalve
adjective: used of mollusks, especially gastropods, as snails etc. [ant: {bivalve}]
noun: a class of mollusks typically having a one-piece coiled shell and flattened muscular foot with a head bearing stalked eyes [syn: {gastropod}]
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