Definition of "endosymbiont" [endosymbiont]

• An organism that lives within the body or cells of another organism. (noun)

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• "I'm perfectly happy to call the endosymbiont theory a "theory" even though it's not established fact, as you say."
• "For that they have to rely on a bacterial endosymbiont."
• "Dr. PITTENDRIGH: So in the absence of this endosymbiont, the body louse does not get the vitamins it needs to survive."