caffeine
Chemistry, Pharmacology. a white, crystalline, bitter alkaloid, C8H10N4O2, usually derived from coffee or tea: used in medicine chiefly as a nervous system stimulant.
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.
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Origin of caffeine
1- Rarely caf·fein .
Other words from caffeine
- caf·fein·ic [ka-fee-nik, kaf-ee-in-ik], /kæˈfi nɪk, ˌkæf iˈɪn ɪk/, adjective
- non·caf·feine, noun
- non·caf·fein·ic, adjective
Words Nearby caffeine
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2024
How to use caffeine in a sentence
Now its lattes and caffeine are flying through the sky in silent drones moving at 80 miles per hour.
With grocery store access limited during the pandemic, drone delivery offers a high-tech boost to business | Alyssa Newcomb | January 11, 2021 | FortuneOf Nuun Sport’s 13 flavors, I highly recommend citrus fruit, strawberry lemonade, and cherry limeade plus caffeine.
I've Tried Many Workout Drinks. Nuun Is the Best. | Will Taylor | December 17, 2020 | Outside OnlineI love drinking tea, but I have to cut off my caffeine intake pretty early in the day if I want to get to sleep at a decent hour.
Mix your own delicious herbal tea using leftover spices | By Kristy Mucci/Saveur | December 4, 2020 | Popular-Science“If you want to understand penicillin or caffeine, you can’t do that on a conventional supercomputer, no matter how big you make it,” Krishna explained.
Quantum computing could reach the market by 2023, says IBM CEO | dzanemorris | December 1, 2020 | FortuneNestlé Chief Executive Officer Mark Schneider skips his afternoon Nespresso, as genetic tests revealed his body processes caffeine only slowly, depriving him of sleep.
This snack food giant wants to wean us off our lockdown cravings | Bernhard Warner | November 7, 2020 | Fortune
The Pentagon security reviewers must have been suffering a dearth of caffeine or sleep.
‘They Don’t Call It SEAL Team 6-Year-Old for Nothing’: Commandos Clash Over Tell-All Book | Kimberly Dozier | November 3, 2014 | THE DAILY BEASTThe story gets out that Obama skipped his usual afternoon dose of caffeine heading toward the U.N. meeting.
Obama, the Coffee Salute, and the Dementia on the Right | Sally Kohn | September 25, 2014 | THE DAILY BEASTThis clean source of caffeine is the next noble, and healthy, substitute for your daily cup of coffee.
Bye Bye Latté, Hello Guayusa: Why The Amazon Holds the Secret to a Cleaner, Healthier Caffeine | Brandon Presser | August 29, 2014 | THE DAILY BEASTA “caffeine nap,” or a quick cup of something caffeinated followed by a nap, outperforms both a nap or caffeine independently.
Einöther authored the most comprehensive review of research on caffeine to date.
Both contain stimulating alkaloids, theobromine and caffeine, and fat is a notable constituent of cocoa.
The Home of the Blizzard | Douglas MawsonIt's thick enough to stand a spoon up in, and it has way more caffeine than the kiddee-pops like Red Bull.
Little Brother | Cory DoctorowI'd totaled about three hours of sleep, and even three cups of the Turk's caffeine mud failed to jump-start my brain.
Little Brother | Cory DoctorowIt appears to be identical with caffeine, the active principle of coffee and tea.
This first term gives rise to a series of bodies in lateral groups, of which the most interesting are caffeine and theobromine.
The Healthy Life, Vol. V, Nos. 24-28 | Various
British Dictionary definitions for caffeine
caffein
/ (ˈkæfiːn, ˈkæfɪˌiːn) /
a white crystalline bitter alkaloid responsible for the stimulant action of tea, coffee, and cocoa: a constituent of many tonics and analgesics. Formula: C 8 H 10 N 4 O 2: See also xanthine (def. 2)
Origin of caffeine
1Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Scientific definitions for caffeine
[ kă-fēn′ ]
A bitter white alkaloid found in tea leaves, coffee beans, and various other plant parts. It is a mild stimulant. Caffeine is a xanthine and similar in structure to theobromine and theophylline. Chemical formula: C8H10N4O2.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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