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Noun: caffeine  ka'feen or 'ka,feen [N. Amer], 'ka,feen [Brit]
  1. A bitter alkaloid found in coffee and tea that is responsible for their stimulating effects
    - caffein

Derived forms: caffeines

Type of: alkaloid

Part of: cha [Brit], char [Brit], coffee, java [N. Amer, informal], joe [N. Amer, informal], tea

Encyclopedia: Caffeine