: a bitter alkaloid C8H10N4O2 found especially in coffee, tea, cacao, and kola nuts and used medicinally as a stimulant and diuretic
Examples of caffeine in a Sentence
Her doctor told her to avoid caffeine.
Recent Examples on the Web
Cocoa powder contains a small amount of caffeine, around 12 milligrams per tablespoon.
—
Jillian Kubala, Health, 4 Nov. 2024
Abdur-Rahim frequently walked across campus to a coffee shop and the student center, and whoever happened to be there was treated to a dose of caffeine and perhaps donut or two.
—Tom Layberger, Forbes, 3 Nov. 2024
Running on adrenaline and continuous infusions of caffeine, its analysts and data scientists were glued to their monitors around the clock, watching the slow trickle of results from Pennsylvania that ultimately would decide the race.
—Josh Rottenberg, Los Angeles Times, 3 Nov. 2024
The small amounts of caffeine in chocolate are another risk, Hill's Pet Nutrition reports.
—Olivia Munson, USA TODAY, 2 Nov. 2024
See all Example Sentences for caffeine 
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Jillian Kubala, Health, 4 Nov. 2024
Abdur-Rahim frequently walked across campus to a coffee shop and the student center, and whoever happened to be there was treated to a dose of caffeine and perhaps donut or two.
—Tom Layberger, Forbes, 3 Nov. 2024
Running on adrenaline and continuous infusions of caffeine, its analysts and data scientists were glued to their monitors around the clock, watching the slow trickle of results from Pennsylvania that ultimately would decide the race.
—Josh Rottenberg, Los Angeles Times, 3 Nov. 2024
The small amounts of caffeine in chocolate are another risk, Hill's Pet Nutrition reports.
—Olivia Munson, USA TODAY, 2 Nov. 2024
See all Example Sentences for caffeine
Dictionary Entries Near caffeine
Cite this Entry
“Caffeine.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/caffeine. Accessed 25 Nov. 2024.
Copy CitationKids Definition
caffeine
noun
caf·feine
ka-ˈfēn 
ˈka-ˌfēn
: a bitter stimulating compound found especially in coffee, tea, cacao, and kola nuts
Medical Definition
caffeine
noun
caf·feine
ka-ˈfēn, ˈka-ˌ; ˈkaf-ē-ən
: a bitter alkaloid C8H10N4O2 found especially in coffee, tea, and kola nuts and used medicinally as a stimulant and diuretic
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