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From Longman Dictionary of Contemporary English
Related topics: Food, Drugs, medicines
caffeinecaf‧feine /ˈkæfiːn $ kæˈfiːn/ noun [uncountable]  DFMDa substance in tea, coffee, and some other drinks that makes you feel more activedecaffeinated Avoid caffeine (=drinks with caffeine) before bedtime. a caffeine-free colacaffeinated /ˈkæfɪneɪtɪd/ adjective
Examples from the Corpus
caffeineProgress in learning how alcohol and caffeine work has had to wait for new knowledge of how the brain works.Avoid caffeine three to four hours before bedtime.He was told to gradually cut these out, along with all other drinks containing caffeine.Obvious examples include caffeine and ephedrine, the latter being readily available to the public in over-the-counter cold remedies.Many brands of aspirin and aspirin substitutes include a significant dose of caffeine.Under the influence of a pint of caffeine the world seemed a friendlier place.You put caffeine behind some other drug you've got inside you, and it gives that drug a kick.It was only after the caffeine began to work that he realized that everyone was kind of waiting for something to happen.Not only must the caffeine be eliminated, but the break-down products have to be eliminated as well.
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