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| an extraordinary or unusual thing, person, or event; an exceptional example or instance. |
| the offspring of a zebra and a donkey. |
in vitro in vi·tro (ĭn vē'trō)
adj.
In an artificial environment outside a living organism.
| in vitro (ĭn vē'trō) Pronunciation Key
In an artificial environment, such as a test tube. Compare in vivo. |
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.