entozoic

/ˌɛntəˈzoʊɪk/
adjective
  1. Living inside the body of another animal; relating to internal parasites.
    • The entozoic habitat of the liver fluke makes it hard to treat.
    • Entozoic infections are common in wild animal populations.
    • Many entozoic organisms have evolved to survive without a digestive system.
Antonyms
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