n.
Pronunciation: ka- ' f ē n, ' ka- ˌ
Function: noun
Etymology: German Kaffein, from Kaffee coffee, from French café
Date: circa 1823
: a bitter alkaloid C 8 H 10 N 4 O 2 found especially in coffee, tea, cacao, and kola nuts and used medicinally as a stimulant and diuretic