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.]

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]

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.

caf·feine

(kă-fēn′)
A bitter white alkaloid found in tea, coffee, and various plants. It is a mild stimulant.
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
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

caffeine

caffein [ˈkæfiːn] ncaffeina

caffeine

(ˈkӕfiːn) , ((American) kӕˈfi:n) noun
a drug found in coffee and tea.

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

caf·feine

n. cafeína, alcaloide presente esp. en el café y el té, estimulante y diurético.

caffeine

n cafeína
References in periodicals archive ?
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.
Taking the typical one step further and several sizes smaller, Pittsburgh-based nutritional supplements company Perfect Day Nutrition has introduced the world's first liquid caffeine pill -- Good Morning Pill Liquicaff.
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.
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.
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.
In a small trial, 61 Parkinson's patients who complained of daytime sleepiness and motor symptoms were either given a placebo or a 100-mg caffeine pill twice a day for three weeks.
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?