Medical Dictionary
caffeine
noun caf·feine \ka-ˈfēn, ˈka-ˌ; ˈkaf-ē-ən\
Medical Definition of CAFFEINE
: a bitter alkaloid C8H10N4O2 found especially in coffee, tea, and kola nuts and used medicinally as a stimulant and diuretic
—caf·fein·ic \ka-ˈfē-nik, ˌkaf-ē-ˈin-ik\ adjective
Seen & Heard
What made you want to look up caffeine? Please tell us where you read or heard it (including the quote, if possible).