What does caffeine mean?

Definitions for caffeinekæˈfin, ˈkæf in

Here are all the possible meanings and translations of the word caffeine.

Princeton's WordNet

  1. caffeine, caffein(noun)

    a bitter alkaloid found in coffee and tea that is responsible for their stimulating effects


  1. caffeine(Noun)

    An alkaloid, CHNO, found naturally in tea and coffee plants which acts as a mild stimulant of the central nervous system.

  2. Origin: From caféine, from café or Coffein, from Kaffee

Webster Dictionary

  1. Caffeine(noun)

    a white, bitter, crystallizable substance, obtained from coffee. It is identical with the alkaloid theine from tea leaves, and with guaranine from guarana

  2. Origin: [Cf. F. cafine. See Coffee.]


  1. Caffeine

    Caffeine is a bitter, white crystalline xanthine alkaloid that acts as a stimulant drug. Caffeine is found in varying quantities in the seeds, leaves, and fruit of some plants, where it acts as a natural pesticide that paralyzes and kills certain insects feeding on the plants, as well as enhancing the reward memory of pollinators. It is most commonly consumed by humans in infusions extracted from the seed of the coffee plant and the leaves of the tea bush, as well as from various foods and drinks containing products derived from the kola nut. Other sources include yerba maté, guarana berries, guayusa, and the yaupon holly. In humans, caffeine acts as a central nervous system stimulant, temporarily warding off drowsiness and restoring alertness. It is the world's most widely consumed psychoactive drug, but unlike many other psychoactive substances, it is legal and unregulated in nearly all parts of the world. Beverages containing caffeine, such as coffee, tea, soft drinks, and energy drinks, enjoy great popularity. In North America, 90% of adults consume caffeine daily. Part of the reason caffeine is classified by the Food and Drug Administration as GRAS is that toxic doses are much higher than typically used doses. Ordinary consumption can have low health risks, even when carried on for years – there may be a modest protective effect against some diseases, including Parkinsons Disease, and certain types of cancer. Caffeine can have both positive and negative effects on anxiety disorders. Some people experience sleep disruption if they consume caffeine, especially during the evening hours, but others show little disturbance and the effect of caffeine on sleep is highly variable.

Chambers 20th Century Dictionary

  1. Caffeine

    kaf′e-in, or kaf-ē′in, n. the alkaloid or active principle of coffee and tea. [Fr. caféine. See Coffee.]

U.S. National Library of Medicine

  1. Caffeine

    A methylxanthine naturally occurring in some beverages and also used as a pharmacological agent. Caffeine's most notable pharmacological effect is as a central nervous system stimulant, increasing alertness and producing agitation. It also relaxes SMOOTH MUSCLE, stimulates CARDIAC MUSCLE, stimulates DIURESIS, and appears to be useful in the treatment of some types of headache. Several cellular actions of caffeine have been observed, but it is not entirely clear how each contributes to its pharmacological profile. Among the most important are inhibition of cyclic nucleotide PHOSPHODIESTERASES, antagonism of ADENOSINE RECEPTORS, and modulation of intracellular calcium handling.

Editors Contribution

  1. caffeine

    A naturally occurring compound found in a variety of plants.

    Caffeine is a natural compound and is found in tea and coffee plants and many many more other varieties of plants.

Suggested Resources

  1. caffeine

    Song lyrics by caffeine -- Explore a large variety of song lyrics performed by caffeine on the Lyrics.com website.


  1. Chaldean Numerology

    The numerical value of caffeine in Chaldean Numerology is: 9

  2. Pythagorean Numerology

    The numerical value of caffeine in Pythagorean Numerology is: 4

Sample Sentences & Example Usage

  1. Francis Ratnieks:

    What we found was that caffeine would have the effect of more sugar, the one that did have caffeine attracted more bees, but in particular the bees who were foraging made more dances, about four times as many dances.

  2. Sheri Zidenberg-Cherr:

    To give you an idea of products containing caffeine, Java Monster contains 100 milligrams per serving ; 5 Hour Energy contains 200 milligrams per serving, and keep in mind that does not include amounts of other stimulants found in energy drinks that can enhance the effects of caffeine.

  3. Ted Kallmyer:

    While the amounts are still much higher than what we experts recommend as a safe daily amount (400 mg), this group of people has, over time, built up their caffeine tolerance and/or their livers process caffeine really well so it doesn't affect them adversely, however, the problem with these products is that they can inadvertently be consumed by people who are not in the targeted category.

  4. Sara Gottfried:

    Caffeine raises your cortisol, and I think a lot of women don’t realize that they're dependent on it and that it’s jacking up their nervous system. So, one thing that happens when you drink a cup of coffee or two or three, is it raises your cortisol level. And that then gives you sugar cravings throughout the day, so that you have this blood sugar that goes up and down, and I want to stabilize it by getting you off of caffeine.

  5. John Higgins:

    There's been several cases described of people that have gone into cardiac arrest after consuming more than one energy beverage, and when they've done sort of further analysis on these individuals, they haven't been able to find anything abnormal other than the very high levels of caffeine and taurine in the toxicology, in one case, a young 28-year-old who drunk eight cans of an energy drink actually went into cardiac arrest, and they found John Higgins arteries of John Higgins heart were completely locked up. When they were able to open them up, all the testing revealed nothing wrong with this person other than he had high levels of caffeine and taurine.

Images & Illustrations of caffeine

Translations for caffeine

From our Multilingual Translation Dictionary

Get even more translations for caffeine »


Find a translation for the caffeine definition in other languages:

Select another language:

Discuss these caffeine definitions with the community:

Word of the Day

Would you like us to send you a FREE new word definition delivered to your inbox daily?

Please enter your email address:     


Use the citation below to add this definition to your bibliography:


"caffeine." Definitions.net. STANDS4 LLC, 2017. Web. 24 Sep. 2017. <http://www.definitions.net/definition/caffeine>.

Are we missing a good definition for caffeine? Don't keep it to yourself...

Nearby & related entries:

Alternative searches for caffeine:

Thanks for your vote! We truly appreciate your support.