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univalve
From The Collaborative International Dictionary of English v.0.48:
Univalve \U"ni*valve\, Univalved \U"ni*valved\, a. [Cf. F. univalve.] (Bot. & Zool.) Having one valve; as, a univalve shell or pericarp. [1913 Webster] .
From The Collaborative International Dictionary of English v.0.48:
Univalve \U"ni*valve\, n. [Uni- + valve: cf. F. univalve.]
(Zool.)
A shell consisting of one valve only; a mollusk whose shell
is composed of a single piece, as the snails and conchs.
[1913 Webster]
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.
[1913 Webster] Univalve
