entozoon

/ˌɛntəˈzoʊɒn/
noun
  1. A single animal that lives inside the body of another animal, especially a parasite.
    • Each entozoon can lay thousands of eggs inside its host.
    • The veterinarian identified an entozoon in the dog's stool sample.
    • An entozoon may spend its entire life cycle within one host animal.
Antonyms
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