: 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
But stimulant medications work a lot more efficiently than caffeine.
—
Alison Escalante, Forbes, 22 Jan. 2025
If your blood pressure is very high, be mindful of your caffeine consumption.
—Mark Gurarie, Verywell Health, 22 Jan. 2025
This morning stop is for good company, but for good caffeine, Ms. Bantman then picks up a €3 cortado or piccolo, to go, from her regular coffee shop before heading to the office.
—Vivian Song, New York Times, 21 Jan. 2025
On the first morning of Doc, an exclusive health and longevity event that convened its inaugural meeting this past October, scoring a caffeine hit required navigating a human obstacle course that had sprung up in the overflow tent.
—Grace Huckins, Robb Report, 20 Jan. 2025
See all Example Sentences for caffeine 
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Alison Escalante, Forbes, 22 Jan. 2025
If your blood pressure is very high, be mindful of your caffeine consumption.
—Mark Gurarie, Verywell Health, 22 Jan. 2025
This morning stop is for good company, but for good caffeine, Ms. Bantman then picks up a €3 cortado or piccolo, to go, from her regular coffee shop before heading to the office.
—Vivian Song, New York Times, 21 Jan. 2025
On the first morning of Doc, an exclusive health and longevity event that convened its inaugural meeting this past October, scoring a caffeine hit required navigating a human obstacle course that had sprung up in the overflow tent.
—Grace Huckins, Robb Report, 20 Jan. 2025
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 26 Jan. 2025.
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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