endosymbiont

noun
en·​do·​sym·​bi·​ont | \ ˌen-dō-ˈsim-ˌbī-ˌänt How to pronounce endosymbiont (audio) , -bē- How to pronounce endosymbiont (audio) \
variants: also endosymbiote \ -​ˌōt How to pronounce endosymbiote (audio) \

Medical Definition of endosymbiont

: a symbiotic organism living within the body of its partner

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