[in vee-troh] 
| (of a biological process) made to occur in a laboratory vessel or other controlled experimental environment rather than within a living organism or natural setting. |
| in vi·tro (ĭn vē'trō) adv. & adj. In an artificial environment outside the living organism: an egg fertilized in vitro; in vitro fertilization. [New Latin in vitrō : Latin in, in + Latin vitrō, ablative of vitrum, glass.] |
In the laboratory; literally, “in glass” (laboratory experiments are often carried out in glass containers). In vitro conditions are distinguished from conditions that actually apply in nature. (Compare in vivo.)
Note: In vitro appears in the expression in vitro fertilization, a way of producing human embryos in a laboratory.
in vitro in vi·tro (ĭn vē'trō)
adj.
In an artificial environment outside a living organism.
troʊ