| 单词 | caffeine |
| 释义 | caffeine (once / 8678 pages) n Good morning! Caffeine keeps you awake! It’s that zippy chemical found in coffee, tea, and sodas. In fact, it comes from the German word for “coffee.” Caffeine is a chemical found naturally in the seeds of some fruits and nuts, like coffee beans and kola nuts. It’s a stimulant, so it makes people feel alert. People love to start their mornings with coffee to help them perk up for the day. The word comes from the German Kaffein, coined in 1830 by a chemist who combined the word for "coffee," Kaffee, with -in, a German chemical suffix. WORD FAMILYcaffeine: decaffeinate+/decaffeinate: decaffeinated USAGE EXAMPLESThe scientists tested slime molds' ability to habituate by challenging them with quinine and caffeine — chemicals that are bitter-tasting but otherwise harmless. Washington Post(Dec 30, 2016) A blood test showed only caffeine was in his system. Los Angeles Times(Dec 30, 2016) A blood test showed that only caffeine was in his system. Washington Times(Dec 30, 2016) n a bitter alkaloid found in coffee and tea that is responsible for their stimulating effects Syn|Hyper caffein alkaloid natural bases containing nitrogen found in plants |
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