Definition of in vitro in English:

in vitro

adjective & adverb

  • (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’
    • ‘In vitro fertilization, or IVF, has helped thousands of couples achieve pregnancy.’
    • ‘In vitro expression of protein is used in functional genomics as a bridge between traditional genomics and proteomics.’


Late 19th century: Latin, literally in glass.


in vitro

/in ˈvēˌtrō/