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| a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes. |
| a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison. |
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.