Thanks for using this online dictionary, we have been helping millions of people improve their use of the english language with its free online services. English definition of caffeine is as below...

Theobromine :: Theobromine (n.) An alkaloidal ureide, C7H8N4O2, homologous with and resembling caffeine, produced artificially, and also extracted from cacao and chocolate (from Theobroma Cacao) as a bitter white crystalline substance; -- called also dimethyl xanthine..

Ureide :: Ureide (n.) Any one of the many complex derivatives of urea; thus, hydantoin, and, in an extended dense, guanidine, caffeine, et., are ureides..

Guaranine :: Guaranine (n.) An alkaloid extracted from guarana. Same as Caffeine.

Caffeine :: Caffeine (n.) A white, bitter, crystallizable substance, obtained from coffee. It is identical with the alkaloid theine from tea leaves, and with guaranine from guarana..

Theine :: Theine (n.) See Caffeine. Called also theina.

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