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Mactra
noun
Mac·tra
\ˈmaktrə\
Definition of Mactra
: the type genus of Mactridae formerly including most members of the family but now restricted to a few somewhat triangular, usually thin-shelled surf clams
mactroid
\-ˌtrȯid\ adjectiveFrom the M-W Editors
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Origin and Etymology of mactra
New Latin, from Greek maktra kneading trough, from massein to knead
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