Usage Note
Caféine is feminine and is the substance name for the stimulant found in coffee, tea, and energy drinks. The adjective caféiné means caffeinated, and décaféiné (or colloquially déca) means decaffeinated. French usage mirrors English closely; sans caféine is the label term for caffeine-free products.
Examples
"Le café contient beaucoup de caféine."
Natural Translation
Coffee contains a lot of caffeine.

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