piddock

English Thesaurus

1. marine bivalve that bores into rock or clay or wood by means of saw-like shells (noun.animal)

hypernym	:	bivalve, lamellibranch, pelecypod,
definition	:	marine or freshwater mollusks having a soft body with platelike gills enclosed within two shells hinged together (noun.animal)

member meronym	:	genus pholas, pholas,
definition	:	type genus of the family Pholadidae: piddocks (noun.animal)