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caffeine

caf·feine [ ka-ˈfēn]

caffeine

noun

[ka-ˈfēn]

Definition of caffeine

: a bitter alkaloid C₈H₁₀N₄O₂ found especially in coffee, tea, cacao, and kola nuts and used medicinally as a stimulant and diuretic

Recent Examples on the Web

//Coca-Cola Energy has 114 mg of caffeine in each 12-ounce serving.
— Danielle Wiener-bronner, CNN, "Coca-Cola Energy is coming to the United States," 1 Oct. 2019
//There is a limit to this pricing power, though, as competing coffee chains, doughnut shops and fast-food establishments have rushed to offer caffeine addicts a cheaper fix.
— Spencer Jakab, WSJ, "Overly Grande Expectations for Starbucks," 1 Nov. 2018
//Rest assured, however, there are products out there that are specifically formulated to bring temporary relief for puffy eyes, Stevenson says, such as products with caffeine, which can help constrict the blood vessels.
— Shannon Romanowski, SELF, "Does Preparation H Actually Help Treat Puffy Eyes?," 28 Dec. 2018
//The fermentation process takes out most of the sugar and caffeine.
— Lydia Gerike, courant.com, "Kombucha comes to Connecticut: Brewers help introduce a new kind of drink to the state," 10 Aug. 2019
//The sugar and caffeine propelled us through a three-hour visit .
— Los Angeles Times, "Scotland a foodie haven? ’Tis true. And so is this: Haggis is kind of great," 20 July 2019
//Avoiding alcohol use — alcohol and even caffeine can actually dehydrate the body.
— NBC News, "Don't fry: 3 stages of heat stroke you need to know," 19 July 2019
//The space hums with an up-all-night youthful energy (no doubt aided by copious amounts of sugar and caffeine), and the coffee jelly in particular is a textural delight.
— Jordan Michelman, latimes.com, "What’s brewing in Chinatown: a microguide to four unique coffee bars," 21 June 2019
//Examples included antibiotics, anti-inflammatory (ibuprofen), anti-depressants, anti-diabetics, stimulants (caffeine), and reproductive and thyroid hormones.
— David Taylor, Houston Chronicle, "Cleveland PD offering safe place to dispose of drugs," 13 Sep. 2019

First Known Use of caffeine

circa 1823, in the meaning defined above

History and Etymology for caffeine

German Kaffein, from Kaffee coffee, from French café

Dictionary Entries near caffeine

More Definitions forcaffeine

caffeine

noun

English Language Learners Definition of caffeine

: a substance that is found especially in coffee and tea and that makes you feel more awake

caffeine

noun

caf·feine | \ ka-ˈfēn , ˈka-ˌfēn\

Kids Definition of caffeine

: a substance found especially in coffee and tea that makes a person feel more awake

caffeine

noun

caf·feine | \ ka-ˈfēn, ˈka-ˌ; ˈkaf-ē-ən \

Medical Definition of caffeine

: a bitter alkaloid C₈H₁₀N₄O₂ found especially in coffee, tea, and kola nuts and used medicinally as a stimulant and diuretic