| Noun | 1. | Pholadidae - a family of Bivalvia mollusk family - a family of mollusks Bivalvia, class Bivalvia, class Lamellibranchia, class Pelecypoda, Lamellibranchia - oysters; clams; scallops; mussels genus Pholas, Pholas - type genus of the family Pholadidae: piddocks |