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also caf·fein  (kă-fēn′, kăf′ēn′)
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.]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.caffein - a bitter alkaloid found in coffee and tea that is responsible for their stimulating effectscaffein - 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


caffeine [ˈkæfiːn] Ncafeína f


nKoffein nt
References in periodicals archive ?
The subjects were asked not to consume alcoholic beverages or caffein and not to perform intense physical activity during the 24 hours prior to the measurements.
Additionally, participants who consumed any beverage with caffein or chocolate in the last 24 h were excluded.
Numerous studies have reported several significant bioactive groups in the cocoa and cocoa products including polyphenols (epicatechin, catechin and procyanidin) (Afoakwa et al., 2008; Arlorio et al., 2008; Ariza et al., 2014; Nsor-Atindana et al., 2012; Hii et al., 2009; Kim et al., 2014), methylxanthines (theobromine, caffein and theophylline) (Caudle et al., 2001; Mhd-Jalil and Ismail, 2008), peptides (albumins, globulins, prolamin, and glutenin) (Voight et al., 1993; Mhd-Jalil and Ismail, 2008) lipids and sterols (Schwan and Wheals, 2004; Lim, 2012), fiber (Paoletti et al., 2012) as well as minerals (magnesium, copper and selenium).