- a white, crystalline, bitter alkaloid, C8H10N4O2, usually derived from coffee or tea: used in medicine chiefly as a nervous system stimulant.
Origin of caffeine
Examples from the Web for caffein
Historical Examples of caffein
Tannic acid, not as free acid, is combined with caffein as a tannate.Human Foods and Their Nutritive Value
The beans are then steam distilled to remove the caffein, dried, and roasted.
The chief factors in coffee goodness are the caffein content and the caffeol.
Salts of an unstable nature are formed with caffein by most acids.
Weigh the residue as caffein and calculate on 7.5 grams of coffee.
- a white crystalline bitter alkaloid responsible for the stimulant action of tea, coffee, and cocoa: a constituent of many tonics and analgesics. Formula: C 8 H 10 N 4 O 2See also xanthine (def. 2)
Word Origin for caffeine
Word Origin and History for caffein
- A bitter white alkaloid often derived from tea or coffee and used chiefly as a mild stimulant and in the treatment of certain kinds of headache.
- 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.