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Entry 2 senses Webster, 1913

Animalcule

· An·i·mal·cule · IPA /ˌænəˈmælˌkjul/
01 n. A small animal, as a fly, spider, etc.
  1. 1.
    A small animal, as a fly, spider, etc.[Obs.]
  2. 2.
    An animal, invisible, or nearly so, to the naked eye. See Infusoria.(Zool.) See: Infusoria
Phrases & compounds
Spermatic animalcules — See Spermatozoa.