/ Dictionary / Index A allopurinol: Meaning and Definition of Find definitions for: al•lo•pu•ri•nol Pronunciation: (al"u-pyoor'u-nôl", -nol"), [key] — n. Pharm. a substance, CHNO, used primarily in the treatment of chronic gout to decrease the synthesis of uric acid. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: allopurinol (Thesaurus) allopolyploid all-or-none law Related Content Daily Word Quiz: agitated Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language