Online Google Dictionary

caffeine 中文解釋 wordnet sense Collocation Usage Collins Definition
Noun
/kaˈfēn/,/ˈkafˌēn/,
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A crystalline compound that is found esp. in tea and coffee plants and is a stimulant of the central nervous system,
  1. A crystalline compound that is found esp. in tea and coffee plants and is a stimulant of the central nervous system

  1. a bitter alkaloid found in coffee and tea that is responsible for their stimulating effects
  2. Caffeine (also caffein) is a bitter, white crystalline xanthine alkaloid that is a psychoactive stimulant drug. Caffeine was discovered by a German chemist, Friedlieb Ferdinand Runge, in 1820. ...
  3. Caffeine is a 2006 comedy starring Marsha Thomason, Mena Suvari, Breckin Meyer, Katherine Heigl, and Mike Vogel. It revolves around relationships of the staff and patrons of the quirky Black Cat Cafe in London one day. Rated R, for mild violence, adult language, and adult content.
  4. An alkaloid, C8H10N4O2, found naturally in tea and coffee plants which acts as a mild stimulant of the central nervous system
  5. (caffeinated) Containing caffeine naturally (e.g., coffee, tea, and cacao [whose seeds are used to make cocoa, chocolate, and their various derivative products]) or as an additive (e.g., soft drinks, sports drinks, or energy drinks); Overly peppy or energetic (as in a person or pet)
  6. A mild stimulant, the most widely used drug in the world.
  7. A slightly bitter alkaloid found in coffee, tea, and many other foods and beverages. Caffeine is stimulating to the heart and nervous system. It is toxic in large doses.
  8. A stimulant contained in coffee, which can boost the heart rate and alertness and, in elevated quantities, can lead to restlessness or insomnia.
  9. The drug contained in coffee. A bitter white alkaloid derived from coffee (or tea) and used in medicine for a mild stimulant or to treat certain kinds of headache.
  10. stimulating compound present in tea
  11. A chemical compound with stimulant properties. Caffeine affects the central nervous system by binding to adenosine receptors in the brain, thereby inhibiting the sleep-promoting actions of adenosine that normally increase with prolonged wakefulness. ...
  12. The drug of choice for most college students.
  13. (ka-FEEN) — A drug that is found in things like coffee, tea, soda, chocolate and some medicines. During pregnancy, limit the caffeine you get each day to 200 milligrams. That’s about the amount in one 12-ounce cup of coffee.
  14. an inhibitor of cAMP phoshodiesterase; it enhances alertness and potentates the effects of other stimulatory drugs by inhibiting the breakdown of cAMP, with the result that cellular processes that are activated tend to remain active longer than they would otherwise. ...
  15. An active, natural ingredient found in coffee, tea, cacao and kola nuts that constricts blood vessels in the skin and reduces water leakage.  Alleviates puffiness and under-eye darkness.
  16. A drug which stimulates the respiratory center of the brain, and is used to treat apnea of prematurity. Consumed by adults in coffee and soft drinks, caffeine has fewer side effects and less stimulant activity in infants.
  17. The drug found in coffee that gives people energy and keeps them awake.
  18. A substance found in the leaves and beans of the coffee tree, in tea, yerba mate, guarana berries, and in small amounts in cocoa. It can also be made in the laboratory, and is added to some soft drinks, foods and medicines. Caffeine increases brain activity, alertness, attention and energy. ...
  19. Assists in regulating sebaceous gland secretions by inhibiting 5-alpha reductase enzyme activity while scavenging free radicals. Helps constrict capillaries and reduce redness.
  20. A drug used to stimulate breathing in premature babies, also commonly found in coffee and carbonated drinks.
  21. a stimulant found in coffee, tea, chocolate, and cola drinks.
  22. Caffeine occurs naturally in more than 60 plants such as coffee beans, tea leaves, kola nuts and cacao beans, and is found in many common foods and beverages such as coffee, tea and chocolate. It is sometimes added to beverages as part of their overall flavor profile. ...
  23. Used in topical creams to reduce puffiness.
  24. A plant derived stimulant often to be found in many foods and drinks.
  25. A natural stimulant that reduces edema (puffiness) in the skin.