*pholas*

‖n.; pl. Pholades [ NL., fr. Gr. fwla`s, fwla`dos, a kind of mollusk. ] (Zool.) Any one of numerous species of marine bivalve mollusks of the genus Pholas, or family Pholadidæ. They bore holes for themselves in clay, peat, and soft rocks. [ 1913 Webster ]