Definition of in utero adjective from the Oxford Advanced Learner's Dictionary

 

in utero

 adjective,adverb
adjective, adverb
BrE BrE//ˌɪn ˈjuːtərəʊ//
 
; NAmE NAmE//ˌɪn ˈjuːtəroʊ//
 
(specialist)
 
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inside a woman’s uterus, before a baby is born The test can be performed in utero. Word OriginLatin.
See the Oxford Advanced American Dictionary entry: in utero