Definition of caffeine in English:

caffeine

noun ˈkafiːn

mass noun

An alkaloid compound which is found especially in tea and coffee plants and is a stimulant of the central nervous system.
chemical formula: C₈H₁₀N₄O₂
Example sentencesExamples
- The caffeine in the coffee brought a welcome kick to wake us up after our super-stodgy lunch.
- Also, try to avoid drinking too much tea and coffee as caffeine can increase anxiety levels.
- Limit the amount of caffeine you consume to no more than two cups of coffee per day.
- She pointed out that I had a habit of not eating at all on race day and drinking a lot of caffeine.
- 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.
- Copious quantities of caffeine and alcohol will stimulate the production of urine, so keep them to a minimum.
- From what I hear it's basically a stimulant similar to caffeine but without the crash at the end.
- It has the same chemical composition as caffeine, and the same physiological action.
- If you like caffeine, you can include two or three tea bags of either black or green tea.
- A tea or coffee plant can probably grow perfectly well without caffeine.
- Eliminate or restrict severely the intake of stimulants such as caffeine or alcohol.
- 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.
- If nothing else, the unexpected jolt of caffeine will get you through the rest of the day.
- A good dose of caffeine stimulated just the right amount of thought, he figured.
- In flowering plant pollen tubes, caffeine disrupts vesicle zonation at the tip and stops elongation.
- It could take all day and part of the night for the body to rid its systems of caffeine.
- The second major effect of caffeine is its increase of dopamine levels in the body.

Origin

Mid 19th century: from French caféine, from café 'coffee'.

Definition of caffeine in US English:

caffeine

noun

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

Origin

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

单词	caffeine
释义	Definition of caffeine in English: caffeine noun ˈkafiːn mass noun An alkaloid compound which is found especially in tea and coffee plants and is a stimulant of the central nervous system. chemical formula: C₈H₁₀N₄O₂ Example sentencesExamples The caffeine in the coffee brought a welcome kick to wake us up after our super-stodgy lunch. Also, try to avoid drinking too much tea and coffee as caffeine can increase anxiety levels. Limit the amount of caffeine you consume to no more than two cups of coffee per day. She pointed out that I had a habit of not eating at all on race day and drinking a lot of caffeine. 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. Copious quantities of caffeine and alcohol will stimulate the production of urine, so keep them to a minimum. From what I hear it's basically a stimulant similar to caffeine but without the crash at the end. It has the same chemical composition as caffeine, and the same physiological action. If you like caffeine, you can include two or three tea bags of either black or green tea. A tea or coffee plant can probably grow perfectly well without caffeine. Eliminate or restrict severely the intake of stimulants such as caffeine or alcohol. 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. If nothing else, the unexpected jolt of caffeine will get you through the rest of the day. A good dose of caffeine stimulated just the right amount of thought, he figured. In flowering plant pollen tubes, caffeine disrupts vesicle zonation at the tip and stops elongation. It could take all day and part of the night for the body to rid its systems of caffeine. The second major effect of caffeine is its increase of dopamine levels in the body. Origin Mid 19th century: from French caféine, from café 'coffee'. Definition of caffeine in US English: caffeine noun 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 Example sentencesExamples Copious quantities of caffeine and alcohol will stimulate the production of urine, so keep them to a minimum. While the colas do contain some caffeine, they are not equal to the real stuff. A good dose of caffeine stimulated just the right amount of thought, he figured. A tea or coffee plant can probably grow perfectly well without caffeine. Limit the amount of caffeine you consume to no more than two cups of coffee per day. She pointed out that I had a habit of not eating at all on race day and drinking a lot of caffeine. In flowering plant pollen tubes, caffeine disrupts vesicle zonation at the tip and stops elongation. They have a similar effect to tea or coffee, since they contain the same alkaloid, caffeine. Decaffenation is the process of removing caffeine from products that contain it. The stimulant effects of caffeine in coffee are well known to help improve energy and alertness. It could take all day and part of the night for the body to rid its systems of caffeine. 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 second major effect of caffeine is its increase of dopamine levels in the body. Eliminate or restrict severely the intake of stimulants such as caffeine or alcohol. He'd made his own cup with extra caffeine to help shake off such an early start to the day. The caffeine in the coffee brought a welcome kick to wake us up after our super-stodgy lunch. It has the same chemical composition as caffeine, and the same physiological action. If you like caffeine, you can include two or three tea bags of either black or green tea. If nothing else, the unexpected jolt of caffeine will get you through the rest of the day. Origin Mid 19th century: from French caféine, from café ‘coffee’.
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