- (of a biological process) occurring or made to occur within a living organism or natural setting.
- (of biological processes or experiments) occurring or carried out in the living organism
Latin; “within a living organism” (see viva).
- Within a living organism.
- Inside a living organism. Compare in vitro.
In nature; literally, “in life.” In vivo conditions are distinguished from those that might exist only in a laboratory. (Compare in vitro.)