/ Dictionary / Index C cinchonine: Meaning and Definition of Find definitions for: cin•cho•nine Pronunciation: (sing'ku-nēn", -nin, sin'-), [key] — n. Pharm. a colorless, crystalline, slightly water-soluble alkaloid, CHNO, a stereoisomer of cinchonidine, obtained from the bark of various species of cinchona and used chiefly as a quinine substitute. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: cinchonine (Thesaurus) cinchonidine cinchonism Related Content Daily Word Quiz: secular Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language