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in vitro

UK:**UK and possibly other pronunciationsUK and possibly other pronunciations/ɪn ˈviːtrəʊ/US:USA pronunciation: IPA and respellingUSA pronunciation: IPA/ɪn ˈvitroʊ/ ,USA pronunciation: respelling(in vētrō)


WordReference Random House Learner's Dictionary of American English © 2026
in vi•tro /ɪn ˈvitroʊ/USA pronunciation  adj. [before a noun]
  1. Laboratorydeveloped or kept alive or growing in a controlled, nonliving environment, as in a laboratory test tube:In vitro fertilization is the fertilization of cells in a test tube.

WordReference Random House Unabridged Dictionary of American English © 2026
in vi•tro  (in vētrō),USA pronunciation 
  1. Biology, Laboratory(of a biological process) made to occur in a laboratory vessel or other controlled experimental environment rather than within a living organism or natural setting. Cf. in vivo.
  • Latin in vitrō literally, in glass
  • 1890–95

Collins Concise English Dictionary © HarperCollins Publishers::
in vitro /ɪn ˈviːtrəʊ/ adv , adj
  1. (of biological processes or reactions) made to occur outside the living organism in an artificial environment, such as a culture medium
Etymology: New Latin, literally: in glass
'in vitro' also found in these entries (note: many are not synonyms or translations):

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