Animalcule Definition
 ănə-mălkyo͝ol 
  animalcules
  
    noun
  
 
    animalcules
  
A microscopic animal; protozoan.
 Webster's New World 
A tiny animal, such as a mosquito.
 American Heritage 
A microscopic or minute organism, such as an amoeba or paramecium, usually considered to be an animal.
 American Heritage Medicine 
(dated) A minute or microscopic animal or protozoan.
Wiktionary 
(archaic) A tiny animal, as a mouse or insect (fly, mosquito, midge).
Wiktionary 
Synonyms: 
  Other Word Forms of Animalcule
Noun
Singular:
 animalculePlural:
 animalculesAnimalcule Is Also Mentioned In
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