Breadcrumb Home > Dictionary > Index I in vitro: Meaning and Definition of Find definitions for: in vi•tro Pronunciation: (in vē'trō), [key] (of a biological process) made to occur in a laboratory vessel or other controlled experimental environment rather than within a living organism or natural setting. Cf. in vivo. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. inviting in vitro fertilization TrendingHere are the facts and trivia that people are buzzing about. Biographies: Notable Jewish Religious Leaders Current Events This Week: September 2023 Hispanic Population and the 2010 U.S. Census Preamble of the United Nations Charter The Jewish Calendar ✖ Related Content Daily Word Quiz: oblique Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language