Definition of in vivo in English:

in vivo

adverb & adjective

  • (of processes) performed or taking place in a living organism.

    [as adverb] ‘fluid transport was measured in vivo’
    The opposite of in vitro
    [as adjective] ‘in vivo studies in animals’
    • ‘An in vivo human bronchial xenograft model system was used to simultaneously analyze electrolyte and fluid transport defects in fully differentiated human cystic fibrosis (CF) and non-CF proximal airways.’
    • ‘Resin plates were contaminated in vivo upon intraoral use by 10 volunteers for 7 nights.’


Early 20th century: Latin, literally in a living thing.


in vivo

/ɪn ˈviːvəʊ/