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The Collaborative International Dictionary
caffein

caffein \caf*fe"in\, Caffeine \Caf*fe"ine\, n. [Cf. F. caf['e]ine. See Coffee.] (Chem.) A white, bitter, crystallizable substance, found in coffee and tea. It is identical with the alkaloid theine from tea leaves, and with guaranine from guarana. It is responsible for most of the stimulating effect of coffee or tea.

Wiktionary
caffein

n. (alternative spelling of caffeine English)

WordNet
caffein

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

Usage examples of "caffein".

Barnum had gone out I gave Aunt Hannah an injection of caffein sodium benzoate.

She looked very smug as she stirred the caffein extract into her cup of water, then sipped it as it began to steam.

I shoveled down reconstituted powdered eggs mixed with rehydrated dehydrated bacon, quickly washing the stuff out of sight with caffein condensate.