Dictionary

caffeine

noun caf·feine \ka-ˈfēn, ˈka-ˌ\

: a substance that is found especially in coffee and tea and that makes you feel more awake

Full Definition of CAFFEINE

:  a bitter alkaloid C8H10N4O2 found especially in coffee, tea, cacao, and kola nuts and used medicinally as a stimulant and diuretic
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Examples of CAFFEINE

  1. Her doctor told her to avoid caffeine.

Origin of CAFFEINE

German Kaffein, from Kaffee coffee, from French café
First Known Use: circa 1823

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CAFFEINE Defined for Kids

caffeine

noun caf·feine \ka-ˈfēn, ˈka-ˌfēn\

Definition of CAFFEINE for Kids

:  a substance found especially in coffee and tea that makes a person feel more awake
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

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