U"ni*valve(?), n. [Uni- + valve: cf. F. univalve.] (Zol.) A shell consisting of one valve only; a mollusk whose shell is composed of a single piece, as the snails and conchs.
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.
U"ni*valved(?), } a. [Cf. F. univalve.] (Bot. & Zol.) Having one valve; as, a univalve shell or pericarp.
U`ni*val"vi*a(), n. pl. [NL.] (Zol.) Same as Gastropoda.
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Sun 09th December 2018