Definition of animalcula in English:

animalcula

Pronunciation /ˌanɪˈmalkjʊlə/

noun

rare
  • Animalcule.

Origin

Early 18th century; earliest use found in Great Britain's Rules of Health. From post-classical Latin animalcula, plural of animalculum, reinterpreted (apparently in English) as showing a Latin feminine singular (with plural animalculae).