animalculum

/ˌænɪˈmælkjʊləm/
noun
  1. A microscopic animal or organism; a single-celled organism (singular form of animalcule).
    • Each animalculum in the sample had a distinct shape and movement pattern.
    • The scientist observed a single animalculum moving across the slide.
    • He drew a detailed picture of the animalculum he saw through the lens.
Antonyms
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