/ Dictionary / Index G guanadrel: Meaning and Definition of Find definitions for: gua•na•drel Pronunciation: (gwä'nu-drel", -drul), [key] — n. Pharm. a substance, CHNOS, used as an antihypertensive. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. guanaco Guanajuato Related Content Daily Word Quiz: procrastinate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language