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Definitions

caffeine

[ka-feen, kaf-een, kaf-ee-in] / kæˈfin, ˈkæf in, ˈkæf i ɪn /


Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

During the test, for example, if a user saw a sponsored prompt that said, “What energy drink has the most caffeine?” and clicked on it, Sparky responded.

From The Wall Street Journal

Coffees made with extra ingredients like mushrooms, protein and collagen are known as "functional coffees" - which aim to provide consumers with benefits beyond the typical caffeine boost.

From BBC

“By two o’clock in the afternoon, they put me in a conference room,” says Matthews of her subsequent caffeine crash.

From The Wall Street Journal

Now, Prime is facing a backlash from physicians and lawmakers who say that the high levels of caffeine in one of its drinks can be harmful to children.

From New York Times

Doctors may worry that caffeine can stimulate the heart and could increase the risk for irregular beats.

From Seattle Times