noun
marine bivalve mollusk having a heavy toothed shell with a deep boat-like inner surface
• Hypernyms: ↑bivalve, ↑pelecypod, ↑lamellibranch
• Member Holonyms: ↑Arca, ↑genus Arca
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nounEtymology: so called from the boat-shaped interior of the shell
: a marine bivalve mollusk of the family Arcidae
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any marine bivalve of the family Arcidae, esp. of the genus Arca, characterized by a heavy shell with a toothed hinge and a deep, boatlike inner surface.
[1850-55]
Useful english dictionary. 2012.