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View synonyms for

caffeine

[ ka-feen, kaf-een, kaf-ee-in ]

noun

  1. 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.
  2. 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.



caffeine

/ ˈkæfiːn; ˈkæfɪˌiːn /

noun

  1. 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
“Collins English Dictionary — Complete & Unabridged” 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

caffeine

  1. 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: C 8 H 10 N 4 O 2 .
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Other Word Forms

  • ·ڱ𾱲· [ka-, fee, -nik, kaf-ee-, in, -ik], adjective
  • ԴDz··ڱ𾱲Ա noun
  • non··ڱ𾱲· adjective
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Word History and Origins

Origin of caffeine1

First recorded in 1820–30; from French éԱ, equivalent to é coffee + -ine -ine 2
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Word History and Origins

Origin of caffeine1

C19: from German Kaffein, from Kaffee coffee
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Compare Meanings

How does caffeine compare to similar and commonly confused words? Explore the most common comparisons:

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Example Sentences

Examples have not been reviewed.

“It’s a very bitter tea. Some people use it as a coffee replacement because it doesn’t have caffeine, but it has a lovely toasted, bitter flavor.”

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While caffeine may help by "reducing sleep inertia", even when these drinks are consumed in the morning, they can still affect you in the evening, he adds.

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They also suggest avoiding caffeine, alcohol or large meals before bed, doing gentle exercise and trying to make your bedroom more comfortable, where possible.

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Down some decaf I actually stopped drinking caffeine — much to my chagrin — for my anxiety issue, so I’ll make myself a little pot of decaf.

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She’d have to look at trigger foods and drinks for hot flashes, like alcohol and caffeine.

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