/ Dictionary / Index G guaiacol: Meaning and Definition of Find definitions for: guai•a•col Pronunciation: (gwī'u-kōl", -kôl"), [key] — n. Pharm. a slightly yellowish, aromatic, crystalline substance, CHO, resembling creosote and usually obtained from guaiacum resin: used in medicine chiefly as an expectorant and local anesthetic. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. guaiac guaiacum Related Content Daily Word Quiz: paradox Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language