Type of mollusk

• A class of mollusks typically having a one-piece coiled shell and flattened muscular foot with a head bearing stalked eyes

Wiktionary Word definitions in Wiktionary
a. 1 having one valve, typically used to refer to mollusks, notably slugs and snails. 2 consisting of a single valve or piece, used to refer to a shell. n. A univalve mollusk or its shell.

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Univalve \U"ni*valve\, Univalved \U"ni*valved\, a. [Cf. F. univalve.] (Bot. & Zo["o]l.) Having one valve; as, a univalve shell or pericarp.

WordNet Word definitions in WordNet
adj. used of mollusks, especially gastropods, as snails etc. [ant: bivalve ] n. a class of mollusks typically having a one-piece coiled shell and flattened muscular foot with a head bearing stalked eyes [syn: gastropod ]

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
of mollusks and shells, 1660s (noun and adjective), from uni- + valve .