/ Dictionary / Index A animalcule: Meaning and Definition of Find definitions for: an•i•mal•cule Pronunciation: (an"u-mal'kyl), [key] — n. a minute or microscopic animal, nearly or quite invisible to the naked eye, as an infusorian or rotifer. a tiny animal, as a mouse or fly. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: animalcule (Thesaurus) animal cracker animalculum Related Content Daily Word Quiz: fresco Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language