caffeine
Americannoun
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Chemistry, Pharmacology. a white, crystalline, bitter alkaloid, C 8 H 10 N 4 O 2 , usually derived from coffee or tea: used in medicine chiefly as a nervous system stimulant.
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Informal. a drink, usually coffee or tea, containing this stimulant.
We sipped our caffeine on the balcony with its views of sea stacks, rocky coves, and the ever-changing ocean.
noun
Other Word Forms
- caffeinic adjective
- noncaffeine noun
- noncaffeinic adjective
Etymology
Origin of caffeine
First recorded in 1820–30; from French caféine, equivalent to café coffee + -ine -ine 2
Compare meaning
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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.
These compounds include theobromine and caffeine, which are linked to heart health.
From Science Daily
Their research combines caffeine with CRISPR, a powerful gene editing tool known as clustered regularly interspaced short palindromic repeats, to explore new ways to treat chronic diseases such as cancer and diabetes.
From Science Daily
Once the morning caffeine rush fades, the company enters a slower stretch.
You've probably seen caffeine eye cream everywhere - it's recommended by influencers, stacked in skincare aisles and tucked into "morning routine" videos promising instant bright eyes.
From BBC
And then she was like, 'Find some caffeine if you can.
From Barron's
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
