/ Dictionary / Index T trifluralin: Meaning and Definition of Find definitions for: tri•flu•ra•lin Pronunciation: (trī-floor'u-lin), [key] — n. Chem. a selective herbicide, CHFNO, used to control weeds. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. trifluorochloromethane trifocal Related Content Daily Word Quiz: penchant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language