/ Dictionary / Index A alkaptonuria: Meaning and Definition of Find definitions for: al•kap•to•nu•ri•a Pronunciation: (al-kap"tu-noor'ē-u, -nyoor'-), [key] — n. Pathol. excessive excretion of homogentisic acid in the urine, caused by a hereditary abnormality of the metabolism of tyrosine and phenylalanine. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: alkaptonuria (Thesaurus) alkapton alkekengi Related Content Daily Word Quiz: feline Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language