caffeine

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caf·feine

also caf·fein  (kă-fēn′, kăf′ēn′)
n.
A bitter white alkaloid, C8H10N4O2, found in certain plants such as cacao, coffee, kola, and tea, that stimulates the central nervous system and body metabolism and is used in medicine, usually in combination with other drugs, to relieve headaches and treat respiratory conditions in premature infants.

[German Kaffein (from Kaffee, coffee) or French caféine, both from French café, coffee; see café.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

caffeine

(ˈkæfiːn; ˈkæfɪˌiːn) or

caffein

n
(Elements & Compounds) a white crystalline bitter alkaloid responsible for the stimulant action of tea, coffee, and cocoa: a constituent of many tonics and analgesics. Formula: C8H10N4O2. See also xanthine2
[C19: from German Kaffein, from Kaffee coffee]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

caf•feine

(kæˈfin, ˈkæf in)

n.
a white, crystalline, bitter alkaloid, C8H10N4O2, usu. derived from coffee or tea, used medicinally as a stimulant.
[1820–30; < French caféine=café coffee + -ine -ine2]
caf•fein•ic (kæˈfi nɪk, ˌkæf iˈɪn ɪk) adj.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.

caf·feine

(kă-fēn′)
A bitter white alkaloid found in tea, coffee, and various plants. It is a mild stimulant.
The American Heritage® Student Science Dictionary, Second Edition. Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.caffeine - a bitter alkaloid found in coffee and tea that is responsible for their stimulating effectscaffeine - a bitter alkaloid found in coffee and tea that is responsible for their stimulating effects
coffee, java - a beverage consisting of an infusion of ground coffee beans; "he ordered a cup of coffee"
tea - a beverage made by steeping tea leaves in water; "iced tea is a cooling drink"
alkaloid - natural bases containing nitrogen found in plants
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
Translations
كَافِيـنمادَّة الكافئين في القهوه والشاي
kofein
koffein
kofeiini
kofein
koffein
kaffín
カフェイン
카페인
kofeinas
kofeīns
kofeín
koffein
สารคาเฟอีน
cafêin

caffeine

[ˈkæfiːn] ncaféine f
Collins English/French Electronic Resource. © HarperCollins Publishers 2005

caffeine

caffein [ˈkæfiːn] ncaffeina
Collins Italian Dictionary 1st Edition © HarperCollins Publishers 1995

caffeine

(ˈkӕfiːn) , ((American) kӕˈfi:n) noun
a drug found in coffee and tea.
Kernerman English Multilingual Dictionary © 2006-2013 K Dictionaries Ltd.

caffeine

كَافِيـن kofein koffein Koffein καφεΐνη cafeína kofeiini caféine kofein caffeina カフェイン 카페인 cafeïne koffein kofeina cafeína кофеин koffein สารคาเฟอีน kafein cafêin 咖啡因
Multilingual Translator © HarperCollins Publishers 2009

caf·feine

n. cafeína, alcaloide presente esp. en el café y el té, estimulante y diurético.
English-Spanish Medical Dictionary © Farlex 2012

caffeine

n cafeína
English-Spanish/Spanish-English Medical Dictionary Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.
References in periodicals archive ?
Riders were given a 400-mg caffeine pill an hour before one ride.
The morning after, sets individuals were either given a 200-mg caffeine pill and a placebo pill, followed by a series of tests.
"While our 200 mg caffeine pill is a proven best-seller, we also offer a low-dose 100 mg caffeine tablet which drives consumer trial by appealing to the new caffeine user or those who can't handle a high-dose caffeine product," the company noted.
More people who took the caffeine pill correctly identified the new images as being similar to, but not the same as, the ones they had seen the day before.
One of the three pills contained 400 mg of caffeine (equivalent to two or three cups of coffee) and the other two looked identical to the caffeine pill but were only harmless placebos.
The only difference was that a 200 mg caffeine pill (Equate [R]-Stay Awake) was used in the place of two 100 mg cups of instant coffee.
He recommended adding an over-the-counter caffeine pill, such as No-Doz.
They gave volunteers a caffeine pill equivalent to four or five cups of coffee.
Drinking coffee isn't always a practical solution to keeping awake when driving, and some people prefer to pop a caffeine pill in the morning and again in midafternoon for a quick boost, rather than rely on coffee--but is this a safe practice?
The subjects were tested under four conditions: low light and a placebo pill; low light and the equivalent of a 200-milligram caffeine pill dependent on the subject's weight; bright light and a placebo pill; and bright light and the caffeine pill.
Volunteers took part in a double-blind trial in which they were either given a 200 milligram caffeine pill or dummy placebo tablet five minutes after studying a series of images.
Volunteers took part in a doubleblind trial in which they were either given a 200 milligram caffeine pill or dummy placebo tablet five minutes after studying a series of images.