from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A microscopic or minute organism, such as an amoeba or paramecium, usually considered to be an animal.
- n. Archaic A tiny animal, such as a mosquito.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A minute or microscopic animal or protozoan.
- n. A tiny animal, as a mouse or insect (fly, mosquito, midge).
from the GNU version of the Collaborative International Dictionary of English
- n. A small animal, as a fly, spider, etc.
- n. An animal, invisible, or nearly so, to the naked eye. See Infusoria.
from The Century Dictionary and Cyclopedia
- n. Any little animal, as a mouse, insect, etc.
- n. A minute or microscopic animal, nearly or quite invisible to the naked eye, as an infusorian or rotifer; an animalculum: as, the bell-animalcule, a ciliate infusorian of the family Vorticellidæ; wheel-animalcule, a rotifer; bear-animalcule, a minute arachnidan of the order Arctisca. See cuts under Arctisca, Rotifera, and Vorticella.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. microscopic organism such as an amoeba or paramecium
New Latin animalculum, diminutive of Latin animal, animal, from anima, soul; see anima.(American Heritage® Dictionary of the English Language, Fourth Edition)
Latin animal + the diminutive suffix -culum (Wiktionary)