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Definition of In vitro
In vitro: Literally in glass, as in a test tube. A test that is performed in vitro is one that is done in glass or plastic vessels in the laboratory.
In vitro is the opposite of in vivo (in a living organism).
Source: MedTerms™ Medical Dictionaryhttp://www.medterms.com/script/main/art.asp?articlekey=4033
Last Editorial Review: 8/4/2002
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