Caffein

The Century Dictionary and Cyclopedia
  • noun. An alkaloid, C8H10N4O2, crystallizing in slender, silk-like needles which have a bitter taste, found in coffee-beans.
    • the GNU version of the Collaborative International Dictionary of English
  • noun. A white, bitter, crystallizable substance, found in coffee and tea. It is identical with the alkaloid theine from tea leaves, and with guaranine from guarana. It is responsible for most of the stimulating effect of coffee or tea.
    • Wiktionary, Creative Commons Attribution/Share-Alike License
  • noun. Alternative spelling of caffeine.
    • WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
  • noun. a bitter alkaloid found in coffee and tea that is responsible for their stimulating effects
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