Wiktionary:Word of the day/2023/January 11

Word of the day
for January 11
animalcule n
  1. (physiology, historical) A sperm cell or spermatozoon; also, the embryo that was formerly thought to be contained inside a spermatozoon in a fully developed state.
  2. (zoology, archaic) A microscopic aquatic animal, including protozoa and rotifers.
  3. (obsolete) A small animal.
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