Lexic.us

Definition of Caffeine

1. Noun. A bitter alkaloid found in coffee and tea that is responsible for their stimulating effects.

Definition of Caffeine

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

Definition of Caffeine

1. a bitter alkaloid used as a stimulant [n -S]

Medical Definition of Caffeine

1. A xanthine derivative that elevates cAMP levels in cells by inhibiting phosphodiesterases. This entry appears with permission from the Dictionary of Cell and Molecular Biology (11 Mar 2008)

Lexicographical Neighbors of Caffeine

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