lamellibranch

noun

1. bivalve.

noun, adjective

1. another word for bivalve (def. 1), bivalve (def. 2)

1. Any of the bivalve mollusks of the subclass Lamellibranchia, the largest group of bivalves. Lamellibranchs have gills that consist of long, folded filaments with cilia at the end that draw in water for respiration and also filter food particles. Lamellibranchs include clams, scallops, and oysters.
2. In former classifications, any bivalve mollusk.