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3 definitions found

From: DICT.TW English-Chinese Dictionary 英漢字典

 caffein
 咖啡鹼;茶精

From: Webster's Revised Unabridged Dictionary (1913)

 caf·fe·in, Caf·fe·ine n.  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.
 

From: WordNet (r) 2.0

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