/ Thesaurus / I Synonyms of in vitro Find synonyms for: Adjective1. in vitro (vs. in vivo), ex vivousage: in an artificial environment outside the living organism; "in vitro fertilization"Adverb1. in vitro, ex vivousage: in an artificial environment outside the living organism; "an egg fertilized in vitro"WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: acquiesce Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language