in vitro

Cultural Dictionary
in vitro [(in vee-troh)]

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.
The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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