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caffeine
noun
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How to pronounce caffeine:

Definition of caffeine:

caffeine (noun):
a bitter alkaloid found in coffee and tea that is responsible for their stimulating effects.
a bitter alkaloid c8h10n4o2 found especially in coffee, tea, cacao, and kola nuts and used medicinally as a stimulant and diuretic

Synonyms for caffeine:

alkaloid
caffein
java
tea

Antonyms for caffeine:

calmative
decaf
downer
sedative
Other 2-syllable words

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