/ Dictionary / Index G glycolic acid: Meaning and Definition of Find definitions for: glycol'ic ac'id Pronunciation: [key] a colorless, crystalline, water-soluble powder, CHO, that is a major substrate for photorespiration in plants: used chiefly for textile printing and dyeing and in pesticides. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. glycolic glycolipid 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