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From The Collaborative International Dictionary of English v.0.48:
Animalcule \An`i*mal"cule\, n. [As if fr. a L. animalculum, dim. of animal.] 1. A small animal, as a fly, spider, etc. [Obs.] --Ray. [1913 Webster] 2. (Zool.) An animal, invisible, or nearly so, to the naked eye. See Infusoria. [1913 Webster] Note: Many of the so-called animalcules have been shown to be plants, having locomotive powers something like those of animals. Among these are Volvox, the Desmidiac[ae], and the siliceous Diatomace[ae]. [1913 Webster] Spermatic animalcules. See Spermatozoa. [1913 Webster]