One of the mysteries of the English language finally explained.
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
- ‘Limit the amount of caffeine you consume to no more than two cups of coffee per day.’
- ‘Decaffenation is the process of removing caffeine from products that contain it.’
- ‘It could take all day and part of the night for the body to rid its systems of caffeine.’
- ‘They have a similar effect to tea or coffee, since they contain the same alkaloid, caffeine.’
- ‘From what I hear it's basically a stimulant similar to caffeine but without the crash at the end.’
- ‘If you like caffeine, you can include two or three tea bags of either black or green tea.’
- ‘In flowering plant pollen tubes, caffeine disrupts vesicle zonation at the tip and stops elongation.’
- ‘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.’
- ‘Eliminate or restrict severely the intake of stimulants such as caffeine or alcohol.’
- ‘The caffeine in the coffee brought a welcome kick to wake us up after our super-stodgy lunch.’
- ‘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.’
- ‘If nothing else, the unexpected jolt of caffeine will get you through the rest of the day.’
- ‘While the colas do contain some caffeine, they are not equal to the real stuff.’
- ‘The second major effect of caffeine is its increase of dopamine levels in the body.’
- ‘It has the same chemical composition as caffeine, and the same physiological action.’
- ‘A good dose of caffeine stimulated just the right amount of thought, he figured.’
- ‘Also, try to avoid drinking too much tea and coffee as caffeine can increase anxiety levels.’
- ‘The stimulant effects of caffeine in coffee are well known to help improve energy and alertness.’
Mid 19th century: from French caféine, from café ‘coffee’.
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