/ Dictionary / Index T tropo-: Meaning and Definition of Find definitions for: tropo- Pronunciation: [key] a combining form meaning “turn,” “reaction, response,” “change,” “troposphere,” used in the formation of compound words: tropophilous. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. tropism tropology Related Content Daily Word Quiz: belligerent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language