A parasitic animal, especially a worm, that lives inside the body of another animal.
From Greek 'entos' (inside) and 'zoon' (animal). This singular form has been in English scientific use since the 18th century to name internal parasites.
An 'entozoan' is basically any parasite that makes its home inside another creature—some can live in your intestines for decades without you realizing it's there.
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