Sphaerium

noun
Sphae·​ri·​um | \ ˈsfirēəm\

Definition of Sphaerium

: a widely distributed genus (the type of the family Sphaeriidae) of small viviparous freshwater bivalve mollusks that have a thin light-colored shell and the siphons separate — see fingernail clam

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History and Etymology for Sphaerium

New Latin, from Greek sphairion, diminutive of sphaira ball, sphere

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