caffeine

caf·feine | \ ka-ˈfēn

, ˈka-ˌfēn \

Definition of caffeine

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

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Examples of caffeine in a Sentence

Her doctor told her to avoid caffeine.

Recent Examples on the Web Consumers are looking for waters that are alkaline or that contain antioxidants or caffeine, and brands are exploring different functional claims as a way to stand out. — Laura Reiley, Washington Post, "As soda sales stagnate, Coca-Cola turns to the vivacious sparkling water market for new fizz," 7 Nov. 2019 In terms of flavor profile, the robusta variety boasts nearly two times the caffeine content of its counterpart and gives off a nutty, full, dark, chocolaty taste. — Fortune, "The First U.S. Importer, Roaster, and Distributor of Vietnamese Coffee Talks of Shifting Industry," 29 Sep. 2019 The same lifestyle factors that can affect your skin overall can damage the moisture barrier: Not drinking enough water or drinking too much alcohol or caffeine. — Leah Prinzivalli, Allure, "The Complete Guide to Your Skin's Moisture Barrier and How to Protect It," 22 Sep. 2019 Seals’ tips for controlling stress during the interview are: Avoid caffeine (coffee, tea, chocolate) prior to the interview. — Bob Weinstein, Houston Chronicle, "It’s important to manage job-interview stress," 21 Sep. 2019 These places are filling stations for the body, where tired drivers can replenish with water, caffeine, taurine, and nicotine or indulge in sugar or salt without judgment, because diets don’t apply here. — Tony Rehagen, BostonGlobe.com, "Farewell to hot dog rollers and roadside chats: an elegy for the American gas station," 11 July 2019 The cream’s caffeine content and cooling tip deflates puffy eyes, and its slight tint masks dark circles without looking like an actual mask. — Ashley Weatherford, The Cut, "Your Allergy Season Survival Guide," 11 Apr. 2018 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

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'caffeine.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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Last Updated

2 Dec 2019

Cite this Entry

“Caffeine.” The Merriam-Webster.com Dictionary, Merriam-Webster Inc., https://www.merriam-webster.com/dictionary/caffeine. Accessed 5 December 2019.

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More Definitions for caffeine

caffeine

noun