bi·valve 
/ˈbaɪˌvælv/ noun
plural bi·valves /ˈbaɪˌvælv/ noun [count] biology : a sea animal that has a shell with two movable parts connected by a hinge
▪ clams, mussels, oysters, and other bivalves
▪ clams, mussels, oysters, and other bivalves
— bivalve adjective
▪ Clams and oysters are bivalve mollusks.
▪ Clams and oysters are bivalve mollusks.
