in vitroBrE /ɪn ˈviːtrəʊ/ 🔊NAmE /ɪn ˈviːtroʊ/ 🔊 adjective (from Latin, biology 生物) (of processes 过程) taking place outside a living body, in scientific apparatus 在生物体外进行的；在科学仪器中进行的◆in vitro experiments在仪器中进行的实验◆the development of in vitro fertilization 体外受精的研究发展 ➡ see also IVF ▸ in vitro adverb◆an egg fertilized in vitro体外受精卵