Definition of caffeine in English:


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  • A crystalline compound that is found especially in tea and coffee plants and is a stimulant of the central nervous system.

    An alkaloid, 1,3,7-trimethylxanthine; chemical formula: C₈H₁₀N₄O₂

    ‘The stimulant effects of caffeine in coffee are well known to help improve energy and alertness.’
    • ‘They have a similar effect to tea or coffee, since they contain the same alkaloid, caffeine.’
    • ‘In flowering plant pollen tubes, caffeine disrupts vesicle zonation at the tip and stops elongation.’
    • ‘Eliminate or restrict severely the intake of stimulants such as caffeine or alcohol.’
    • ‘From what I hear it's basically a stimulant similar to caffeine but without the crash at the end.’
    • ‘Also, try to avoid drinking too much tea and coffee as caffeine can increase anxiety levels.’
    • ‘The caffeine in the coffee brought a welcome kick to wake us up after our super-stodgy lunch.’
    • ‘A tea or coffee plant can probably grow perfectly well without caffeine.’
    • ‘Copious quantities of caffeine and alcohol will stimulate the production of urine, so keep them to a minimum.’
    • ‘A good dose of caffeine stimulated just the right amount of thought, he figured.’
    • ‘It has the same chemical composition as caffeine, and the same physiological action.’
    • ‘Limit the amount of caffeine you consume to no more than two cups of coffee per day.’
    • ‘If you like caffeine, you can include two or three tea bags of either black or green tea.’
    • ‘She pointed out that I had a habit of not eating at all on race day and drinking a lot of caffeine.’
    • ‘He'd made his own cup with extra caffeine to help shake off such an early start to the day.’
    • ‘Decaffenation is the process of removing caffeine from products that contain it.’
    • ‘While the colas do contain some caffeine, they are not equal to the real stuff.’
    • ‘It could take all day and part of the night for the body to rid its systems of caffeine.’
    • ‘If nothing else, the unexpected jolt of caffeine will get you through the rest of the day.’
    • ‘The second major effect of caffeine is its increase of dopamine levels in the body.’



/kaˈfēn/ /kæˈfin/ /ˈkaˌfēn/ /ˈkæˌfin/


Mid 19th century from French caféine, from café ‘coffee’.