noun ·Uncommon ·Advanced level

Definitions

Noun

1. 1
   Any mollusc belonging to the taxonomic class Bivalvia, characterized by a shell consisting of two hinged sections, such as a scallop, clam, mussel or oyster.
2. 2
   marine or freshwater mollusks having a soft body with platelike gills enclosed within two shells hinged together wordnet
3. 3
   A pericarp in which the seedcase opens or splits into two parts or valves.

Adjective

1. 1
   used of mollusks having two shells (as clams etc.) wordnet

Synonyms

All synonyms

bivalvedlamellibranchlamellibranchpelecypodunivalve

Antonyms

All antonyms

univalve

Etymology

From bi- (“two”) + valve.

Related phrases

seed case

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.