in vi ‧ tro fer ‧ ti ‧ li ‧ za ‧ tion /ɪn ˌviːtrəʊ fɜːtəlaɪˈzeɪʃ ə n $ -troʊ fɜːrtələ-/ BrE AmE noun [uncountable] technical
[ Date: 1900-2000 ; Language: Latin ; Origin: in vitro 'in glass' ]
a process in which a human egg is ↑ fertilize d outside a woman’s body ⇨ test-tube baby