univalve

Having a shell consisting of a single valve or piece. Used of a mollusk.

Composed of a single valve or piece. Used of a shell.

A univalve mollusk; a gastropod.

Having one valve only, as a mollusk; not bivalve or multivalve; univalved or univalvular. See II.

Having the carapace single, or not hinged in the middle line: specifying the cladocerous or daphniaceous crustaceans. [Now rare.] In botany, consisting of one valve or piece.

In conchology, a univalve mollusk or its shell; a shell consisting of a single piece; formerly, a member of one of three Linnean divisions of Testacea, as distinguished from bivalves and multivalves.

body-whorl or aperture are collectively the spire, ending at the tip, point, or apex. The opposite end of the shell is the base, which often presents a depression, the umbilicus; the circumference, a completely lipped aperture, is the peristome. The spiral line between the successive whorls or volutions is the suture. See words italicized above with various cuts there, or there cited.

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

Having one valve.

having one valve, typically used to refer to mollusks, notably slugs and snails.