Definitions for: Caffeine

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

Webster (1913) Definition: Caf*fe"ine, n. [Cf. F. caf['e]ine. See Coffee.]
(Chem.)
A white, bitter, crystallizable substance, obtained from
coffee. It is identical with the alkaloid theine from tea
leaves, and with guaranine from guarana.

Synonyms: caffein

See Also: alkaloid, coffee, java, tea