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Caffeine

British pronunciation/kˈæfiːn/
American pronunciation/kæˈfin/
Caffeine
[NOUN]
1

a bitter alkaloid found in coffee and tea that is responsible for their stimulating effects

synonyms : caffein
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Examples
1. Too much caffeine can sometimes cause a headache.
2. Caffeine launches a double threat on your slumber.
3. And caffeine produces some short term gains.
4. Caffeine stimulates frontal cortex.
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