/ Dictionary / Index H hyaluronic acid: Meaning and Definition of Find definitions for: hy'a•lu•ron'ic ac'id Pronunciation: (hī'u-loo-ron'ik, hī"-), [key] — Biochem. Biochem. a mucopolysaccharide serving as a viscous medium in the tissues of the body and as a lubricant in joints. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. hyaloplasm hyaluronidase Related Content Daily Word Quiz: ounterfeit Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language