in vitro
/ɪnˈviːtrəʊ/adjective & adverb
- Biology (of processes or reactions) taking place in a test tube, culture dish, or elsewhere outside a living organism【生】（指过程或反应）体外（的）, 离体（的）, 用试管进行的：
as adj. in vitro fertilization.试管授精。IN VIVO的反义词。
词源
Latin， literally 'in glass'.