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
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)