Definition of in utero adjective from the Oxford Advanced American Dictionary

 

in utero

 adjective,adverb
adjective, adverb
NAmE//ɪn ˈyut̮əroʊ//
 
(technology)
 
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inside a woman's uterus, before a baby is born The test can be performed in utero.
See the Oxford Advanced Learner's Dictionary entry: in utero