caf·feine also caf·fein   Pronunciation Key  (k-fn, kfn, kf-n)
n.
A bitter white alkaloid, C8H10N4O2, often derived from tea or coffee and used in medicine chiefly as a mild stimulant and to treat certain kinds of headache.
 

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[German Kaffein(from Kaffee, coffee), or French caféine both from French café, coffee. See café.]
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caffein·ated (kf-ntd) adj.

Source: The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2000 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
 

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caffeine

\Caf*fe"ine\, n. [Cf. F. caf['e]ine. See Coffee.] (Chem.) A white, bitter, crystallizable substance, obtained from coffee. It is identical with the alkaloid theine from tea leaves, and with guaranine from guarana.
Source: Webster's Revised Unabridged Dictionary, © 1996, 1998 MICRA, Inc.
 

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caffeine

n : a bitter alkaloid found in coffee and tea that is responsible for their stimulating effects [syn: caffein]
Source: WordNet ® 1.6, © 1997 Princeton University

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