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 ?
However, as Tom is about to discover, there's a very good reason Mac has been behaving so erratically - Marnie and James have swapped his sleeping tablets for caffeine pills, which would make anyone edgy.
However, as Tom is about to discover, there's a reason Mac has been behaving erratically - Marnie and James swapped his sleeping tablets for caffeine pills.
Most caffeine pills contain 100-200 mg each, and while caffeine content in energy drinks and "shots" varies, some approach or slightly exceed 400 mg.
Gosselaar's appearance will include a recreation of the famous "Saved by the Bell" scene involving Jessie Spano (Elizabeth Berkley) getting caught by Zack Morris (Gosselaar) using caffeine pills.
ATHENS, Ga., , Rabi'I 18, 1437, December 29, 2015, SPA -- Caffeine from coffee may be just as beneficial for athletes' endurance as caffeine pills, researchers found in a review of studies, according to UPI.
"There's the potential that getting your caffeine by drinking coffee has similar endurance benefits as taking caffeine pills."
He advises against caffeine pills, reminding users that “there's plenty of caffeine in coffee or tea, and you get beneficial polyphenol compounds via nature's natural delivery systems.”
The study, which involved 160 people between the ages of 18 and 30, showed that giving a dose of 200 mg caffeine pills (roughly equivalent to two mugs of instant coffee) enhanced their ability to distinguish between subtly different objects one day after studying them.
The more hardcore among us will use energy drinks or pop caffeine pills.