- bivalve⇄adj. having two parts hinged together.
- bivalve⇄bivalve, noun, adjective.
- bivalve⇄noun 1. any mollusk whose shell consists of two parts hinged together so that it will open and shut like a book; lamellibranch; pelecypod. Oysters and clams are bivalves.
2. a seed capsule that splits in two halves, such as a pod of a pea.