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Pisidium
noun
Pi·sid·i·um
\-ēəm\
Definition of Pisidium
: a genus of nearly cosmopolitan minute freshwater bivalves (family Sphaeriidae) usually somewhat smaller than those of the genus Sphaerium and having the siphons united at their ends
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Origin and Etymology of pisidium
New Latin, diminutive of Latin pisum pea
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