In vivo

In the living organism, as opposed to in vitro (in the laboratory).

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In the living body, referring to a process or reaction occurring therein. Cf.:in vitro. [L. in the living being]

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in vi·vo in-'vē-(.)vō adv or adj

1) in the living body of a plant or animal <in vivo synthesis of DNA> <microorganisms are not ordinarily destroyed in vivo by bacteriostatic drugs (Jour. Amer. Med. Assoc.)>

2) in a real-life situation <observing a patient's behavior in vivo>

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Latin: describing biological phenomena that occur or are observed occurring within the bodies of living organisms.

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in vi·vo (in veґvo) [L.] within the living body.