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2 definitions found
 for caffein
From The Collaborative International Dictionary of English v.0.48 :

  caffein \caf*fe"in\, Caffeine \Caf*fe"ine\, n. [Cf. F.
     caf['e]ine. See Coffee.] (Chem.)
     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.
     [1913 Webster + WordNet 1.5]

From WordNet (r) 3.0 (2006) :

      n 1: a bitter alkaloid found in coffee and tea that is
           responsible for their stimulating effects [syn: caffeine,

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