[sing-kuh-neen, -nin, sin-]
noun Pharmacology.
a colorless, crystalline, slightly water-soluble alkaloid, C 19 H 22 N 2 O, a stereoisomer of cinchonidine, obtained from the bark of various species of cinchona and used chiefly as a quinine substitute.

1815–25; cinchon(a) + -ine2 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
cinchonine (ˈsɪŋkəˌniːn)
an insoluble crystalline alkaloid isolated from cinchona bark, used to treat malaria. Formula: C19H22N2O

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

cinchonine cin·cho·nine (sĭng'kə-nēn', sĭn'chə-)
An alkaloid derived from the bark of various cinchona trees and used as an antimalarial agent.

The American Heritage® Stedman's Medical Dictionary
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