Definition of in vitro in English:

in vitro

adverb & adjective

Biology
  • (of a process) performed or taking place in a test tube, culture dish, or elsewhere outside a living organism.

    [as adjective] ‘in vitro fertilization’
    The opposite of in vivo
    [as adverb] ‘the parasites could not be grown in vitro’

Origin

Late 19th century: Latin, literally in glass.

Pronunciation:

in vitro

/ɪn ˈviːtrəʊ/