caffeinenoun [ U ]uk /ˈkæf.iːn/ us /ˈkæf.iːn/
Examples from literature
- Caffeine wakes us up and gives us energy.
- Many people like tea and coffee because of the caffeine in these drinks.
- Effects of Tea and Coffee. —In addition to the stimulating agent caffeine, tea and coffee contain a bitter, astringent substance, known as tannin.
- In chemical composition caffeine closely resembles a waste, called uric acid, and in the body is converted into this substance.
- Tea and coffee contain a drug, called caffeine, which acts upon the nervous system and which may, on this account, interfere with the proper control of the heart.
- The first trial to combat or prevent this drowsiness was made with caffeine.
- They are usually so addicted to caffeine, cigarettes, alcohol, and so forth, that when they had fasted, even briefly, their bodies were forced to dip into highly-polluted fat reserves while simultaneously the body begins withdrawal.