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caf·feinealso caf·fein (kă-fēn′, kăf′ēn′)
A bitter white alkaloid, C8H10N4O2, found in certain plants such as cacao, coffee, kola, and tea, that stimulates the central nervous system and body metabolism and is used in medicine, usually in combination with other drugs, to relieve headaches and treat respiratory conditions in premature infants.
[German Kaffein (from Kaffee, coffee) or French caféine, both from French café, coffee; see café.]
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|Noun||1.||caffein - a bitter alkaloid found in coffee and tea that is responsible for their stimulating effects|
coffee, java - a beverage consisting of an infusion of ground coffee beans; "he ordered a cup of coffee"
tea - a beverage made by steeping tea leaves in water; "iced tea is a cooling drink"
alkaloid - natural bases containing nitrogen found in plants