Definitions for "In vitro"
Vitro” is derived from the Latin referring to glass. Thus in vitro means occurring in laboratory apparatus, such as a test tube. When a medication is effective in vitro it means it has been shown in a laboratory to have an action in an artificial or “glass” environment – a test tube, for example. Usually the first stage of testing a new medication is in vitro research.
In a test-tube or other laboratory environment.
From the Latin meaning "in glass". In vitro tests do not involve the use of living vertebrate animals.