endosymbiont

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endosymbiont

(ĕn′dō-sĭm′bē-ŏnt′, -bī-)
n.
An organism living inside another organism in an endosymbiotic relationship.

endosymbiont

, endosymbiote (en″dō-sim′bē″ont″) (en″dō-sim′bē″ōt″) [ endo- + symbiont or symbiote]
An organism that lives inside the body of another, benefiting both organisms. In some cases of endosymbiosis, neither organism would survive without the other.