Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • 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.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. An alkaloid, C8H10N4O2, found naturally in tea and coffee plants which acts as a mild stimulant of the central nervous system.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a bitter alkaloid found in coffee and tea that is responsible for their stimulating effects

Etymologies

German Kaffein (from Kaffee, coffee) or French caféine, both from French café, coffee; see café.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From French caféine, from café ("coffee") or German Koffein, from Kaffee ("coffee") (Wiktionary)

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