Breadcrumb Home > Dictionary > Index T tropism: Meaning and Definition of Find definitions for: tro•pism Pronunciation: (trō'piz-um), [key] — n. Biol. an orientation of an organism to an external stimulus, as light, esp. by growth rather than by movement. -tropism Pronunciation: [key] var. of Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: tropism (Thesaurus) tropine tropo- 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 50 Spookiest Halloween Quotes Preamble of the United Nations Charter The Jewish Calendar ✖ Related Content Daily Word Quiz: quincunx Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language