'Guaranine' definitions:

Definition of 'Guaranine'

From: GCIDE

Guaranine \Gua"ra*nine`\, n. (Chem.) An alkaloid extracted from guarana. Same as Caffeine. [1913 Webster]

Definition of 'guaranine'

From: GCIDE

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. [1913 Webster + WordNet 1.5]

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