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Meaning of caffeine

caf•feine

Pronunciation: (ka-fēn', kaf'ēn, kaf'ē-in), [key]
— n. Chem., Pharm.
  1. a white, crystalline, bitter alkaloid, CHNO, usually derived from coffee or tea: used in medicine chiefly as a nervous system stimulant.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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