/ Dictionary / Index H hydroxychloroquine: Meaning and Definition of Find definitions for: hy•drox•y•chlo•ro•quine Pronunciation: (hī-drok"si-klôr'u-kwēn", -kwin, -klōr'-), [key] — n. Pharm. a colorless crystalline solid, CHClNO, used in the treatment of malaria, lupus erythematosus, and rheumatoid arthritis. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: hydroxychloroquine (Thesaurus) hydroxybutyric acid hydroxyketone Related Content Daily Word Quiz: placid Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language