- A bitter, colorless, amorphous powder or crystalline alkaloid, C20H24N2O2·3H2O, derived from certain cinchona barks and used in medicine to treat malaria. (noun)
- Any of various compounds or salts of quinine. (noun)
- A bitter crystalline alkaloid extracted from cinchona bark, the salts of which are used as a tonic, antipyretic, analgesic, etc, and in malaria therapy. Formula: C20H24N2O2 (noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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