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 guaranine is as below...

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..

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

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