Similar words: decaffeinated, scaffold, scaffolding, feint, public affairs, gaffe, life insurance, gaffer. Meaning: ['kæfiːn] 
n. a bitter alkaloid found in coffee and tea that is responsible for their stimulating effects.
n. a bitter alkaloid found in coffee and tea that is responsible for their stimulating effects. 
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1. Caffeine constricts the blood vessels in your body.
2. I discovered I was hypersensitive to caffeine.
3. Caffeine can cause palpitations and headaches.
4. The caffeine in coffee can jangle the nerves.
5. I'm trying to cut down on caffeine.
6. Caffeine is bad for your health.
7. It is a well-known fact that caffeine is a stimulant.
8. Avoid caffeine before bedtime.
9. As little as 50mg of caffeine can produce pharmacological effects.
10. Caffeine, which is found in coffee and tea, is a mild stimulant.
11. Caffeine is the active constituent of drinks such as tea and coffee.
12. I need my fix of caffeine in the morning or I can't think.
13. Another possibility is that caffeine affects skeletal muscles indirectly.
14. In fact, caffeine is arguably the safest recreational drug.
15. Caffeine received no better press in the twentieth century.
16. Half of the subjects were given caffeine.
17. The caffeine in coffee is mildly addictive.
18. Pregnant women should reduce their intake of caffeine.
19. Still(sentencedict.com), caffeine is not aspirin.
20. Avoid caffeine three to four hours before bedtime.
21. Also: no caffeine, nicotine, alcohol or recreational drugs.
22. And they can be altered by caffeine use, stress, and the amount of fat under the skin.
23. Even moderate doses of caffeine can set off this peristalsis whether or not the body was ready to dispose of its feces.
24. The connection between caffeine and religious devotion also figures prominently in one of the common legends about coffee.
25. The evidence of developmental problems arising from lower levels of caffeine consumption is less clear.
26. Arabica beans are harder to grow, produce more flavorful coffee, and contain about half the caffeine of robusta beans.
26. Wish you can benefit from our online sentence dictionary and make progress every day!
27. This removal is very effective because methylene chloride and other caffeine solvents evaporate at temperatures between 100 and 120 degrees.
28. As interesting as such examples are, of course, they in no way prove that caffeine actually improves mental functioning.
29. Some scientists believe there may be a link between caffeine and heart disease.
30. Women may respond to the unpleasant feelings associated with the peak progesterone levels by increasing their caffeine intake.
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