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a white, crystalline, bitter alkaloid, C 8 H 10 N 4 O 2 , usually derived from coffee or tea: used in medicine chiefly as a nervous system stimulant.
Contemporary Examples

Japan’s Fiscal Crossroads: Will Abenomics Mean Tougher Changes? Daniel Gross July 25, 2013
Can Coffee Save Your Life? Anneli Rufus October 27, 2011
What Happened When I Replaced Coffee With 30 Seconds of Exercise Gregory Ferenstein December 1, 2013
Forget 5-Hour Energy: Tea Is a Better Buzz Gregory Ferenstein July 21, 2014
Was Demi Moore Really Addicted to Red Bull? Anneli Rufus January 31, 2012

Historical Examples

Under Four Administrations Oscar S. Straus
Alcohol: A Dangerous and Unnecessary Medicine, How and Why Martha M. Allen
The Social Gangster Arthur B. Reeve
Six Cups of Coffee Maria Parloa
Cooley’s Practical Receipts, Volume II Arnold Cooley

a white crystalline bitter alkaloid responsible for the stimulant action of tea, coffee, and cocoa: a constituent of many tonics and analgesics. Formula: C8H10N4O2 See also xanthine (sense 2)
A bitter white alkaloid found in tea leaves, coffee beans, and various other plant parts. It is a mild stimulant. Caffeine is a xanthine and similar in structure to theobromine and theophylline. Chemical formula: C8H10N4O2.


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