in uteroPronunciation: /ɪn ˈjuːtərəʊ/Definition of in utero adverb & adjective in a woman’s uterus; before birth: [as adverb]:this damage may occur in utero [as adjective]:the in utero development of the gastrointestinal tractOrigin:Latinin utero in other Oxford dictionaries Definition of in utero in the US English dictionary