Univalve

[,ju:ni'vælv]

(adj.) used of mollusks, especially gastropods, as snails etc. .

Edited by Laurence--From WordNet

(n.) A shell consisting of one valve only; a mollusk whose shell is composed of a single piece, as the snails and conchs.

(a.) Alt. of Univalved

Typist: Thaddeus

adj. having one valve or shell only.—n. a shell of one valve only: a mollusc whose shell is composed of a single piece.—adj. Unival′vular.

Typed by Beryl