Caffeine

['kæfiːn] or ['kæfin]

Definition

(noun.) a bitter alkaloid found in coffee and tea that is responsible for their stimulating effects.

Checked by Bonnie--From WordNet

Definition

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

Editor: Maris

Definition

n. the alkaloid or active principle of coffee and tea.

Typist: Nicholas