Caffein



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.
Historical Examples

The Toxicity of Caffein William Salant
All About Coffee William H. Ukers
The Toxicity of Caffein William Salant
All About Coffee William H. Ukers
The Toxicity of Caffein William Salant
All About Coffee William H. Ukers
The Toxicity of Caffein William Salant
The Toxicity of Caffein William Salant
Human Foods and Their Nutritive Value Harry Snyder
The Toxicity of Caffein William Salant

noun
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)
n.
caffeine
(kā-fēn’)
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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