/ Dictionary / Index O orthotropism: Meaning and Definition of Find definitions for: or•thot•ro•pism Pronunciation: (ôr-tho'tru-piz"um), [key] orthotropic tendency or growth. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. orthotropic orthotropous Related Content Daily Word Quiz: fervor Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language