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animalcule (n.)

"very small animal," especially a microscopic one, 1590s, from Late Latin animalculum (plural animalcula), diminutive of Latin animal "living being" (see animal (n.)). In early use also of mice, insects, etc. Related: Animalcular; animalculine.

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Definitions of animalcule

animalcule (n.)
microscopic organism such as an amoeba or paramecium;
Synonyms: animalculum
From wordnet.princeton.edu