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Pisidium

noun
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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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History and Etymology for Pisidium

New Latin, diminutive of Latin pisum pea

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“Pisidium.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/Pisidium. Accessed 15 Aug. 2020.

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