Webster's English Dictionary

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quinine

qui.nine \'kwi--.ni-n, Brit kwin-'e-n\ n [Sp quina cinchona, short for 
   quinaquina, fr. Quechua] 1: a bitter crystalline alkaloid C20H24N2O2 from 
   ci nchona bark used in medicine 2: a salt of quinine used as a febrifuge, 
   antimalarial, antiperiodic, and b itter tonic