GNU Collaborative International Dictionary of English

Found one definition

1.       
   ‖Pholas , n.; pl. Pholades . [NL., fr. Gr. φωλάς, φωλάδος, 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