Definition of in vitro adjective from the Oxford Advanced American Dictionary

 

in vitro

 adjective
adjective
NAmE//ɪn ˈvitroʊ//
 
(from Latin)(biology)
 
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(of processes) taking place outside a living body, in scientific apparatus in vitro experiments the development of in vitro fertilization see also IVF
in vitroadverb
 
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an egg fertilized in vitro