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pho·las | \ ˈfōləs \
Definition of pholas
1 capitalized : a large genus of bivalve usually marine mollusks (family Pholadidae) with an elongate-oval rough shell having no hinge ligament, gaping at the end, and having two accessory valves to protect the dorsal margin that with the foot serves as a rasp to bore in wood and stone
2 plural pholades\ -ləˌdēz \ : any mollusk of the genus Pholas or of the family Pholadidae : piddock
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