/ˌɪn ˈvi:trəʊ ||; ˌɪn ˈvitro/adj adv(technical术语) (used about a process or a reaction) taking place in a glass tube or dish, not inside a living body （指过程或反应）在试管中（的），在生物体外（的）: in vitro experiments 试管中的试验the development of in vitro fertilization 体外受精的发展an egg fertilized in vitro 体外受精卵