Etymology
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in vitro

1892, scientific Latin; "in a test tube, culture dish, etc.;" literally "in glass," from Latin vitrum "glass" (see vitreous).

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Definitions of in vitro
1
in vitro (adv.)
in an artificial environment outside the living organism;
an egg fertilized in vitro
Synonyms: ex vivo
2
IN VITRO (adj.)
of a biological process occurring in an artificial environment outside the living organism;
in vitro fertilization
Synonyms: ex vivo
From wordnet.princeton.edu