animalcule

/ˌænɪˈmælkjuːl/
noun
  1. A very small animal or organism that can only be seen with a microscope.
    • Under the microscope, the pond water was full of tiny animalcules swimming around.
    • The biology class observed animalcules in a drop of vinegar through their microscopes.
    • Leeuwenhoek was the first person to describe animalcules in his letters to the Royal Society.
Antonyms
What does "animalcule" mean? | whatsthatwordmean | whatsthatwordmean