caffeine

noun

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

Some of us are quick to metabolize an after-dinner espresso; others swear off caffeine after noon. — Laura Regensdorf, Vogue, "How to Get a Better Night’s Sleep—And Why It Should Be Your Top Priority (Really)," 1 Nov. 2018 This natural beauty pick has some major de-puffing powers — the caffeine in its formula shrinks puffy morning eyes in a matter of a minute (Allure editors can attest to this). — Tanisha Pina, Allure, "13 Beauty Essentials You Should Stock Up On During Amazon Prime Day," 16 July 2018 In 2010, Four Loko nixed the caffeine from its recipe. — Sean Rossman, USA TODAY, "A sangria so potent, it reminds drinkers of Four Loko," 17 May 2018 The supermodel, who alongside her husband Tom Brady follows a strict no-white sugar, no-white flour, no-MSG, no-caffeine, no-fungus, no-dairy diet, told WSJ. — Ana Calderone, PEOPLE.com, "Gisele Bündchen's 'Guilty Pleasure' Food Is 10 Dunkin' Donuts Munchkins—Yes, Really," 27 Mar. 2018 Ruggiero says that the caffeine in coffee works to narrow the swollen blood vessels in your head, elevating your pain. — Lori Keong, Marie Claire, "10 Expert-Approved Secrets to Hack Your Hangover," 12 Dec. 2016 These are likely due to certain compounds in coffee but may also be partially because of the caffeine. — Tori Rodriguez, Woman's Day, "5 "Bad" Habits That Are Actually Good for You," 3 Aug. 2016 Your caffeine and alcohol intake can be major players. — Carolyn L. Todd, SELF, "How Much Sleep Do I Need?," 21 Mar. 2019 That makes sense since the caffeine in it is, of course, energizing! — Jaclyn London, Ms, Rd, Cdn, Good Housekeeping, "Keto Diet Pills and Supplements May Hurt Your Health and Waste Your Money," 16 Jan. 2019

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.