/ Thesaurus / I Synonyms of in vivo Find synonyms for: Adjective1. in vivo (vs. in vitro)usage: within a living organism; "in vivo techniques"Adverb1. in vivousage: in the living organism; "studies conducted in vivo"WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: gregarious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language