/ Dictionary / Index H hydroxyproline: Meaning and Definition of Find definitions for: hy•drox•y•pro•line Pronunciation: (hī-drok'si-prō'lēn, -lin), [key] — n. Biochem. a nutritionally nonessential amino acid, CHNO, found chiefly in collagen. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: hydroxyproline (Thesaurus) hydroxynaphthalene hydroxyurea Related Content Daily Word Quiz: inutiae Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language