caffeine

3 ENTRIES FOUND:

caf·feine

noun \ka-ˈfēn, ˈka-ˌ\

: a substance that is found especially in coffee and tea and that makes you feel more awake

Full Definition of CAFFEINE

:  a bitter alkaloid C8H10N4O2 found especially in coffee, tea, cacao, and kola nuts and used medicinally as a stimulant and diuretic

Examples of CAFFEINE

  1. Her doctor told her to avoid caffeine.

Origin of CAFFEINE

German Kaffein, from Kaffee coffee, from French café
First Known Use: circa 1823

Other Biochemistry Terms

bile, biodegradable, capsaicin, keratin, metabolism

caf·feine

noun \ka-ˈfēn, ˈka-ˌ; ˈkaf-ē-ən\   (Medical Dictionary)

Medical Definition of CAFFEINE

: a bitter alkaloid C8H10N4O2 found especially in coffee, tea, and kola nuts and used medicinally as a stimulant and diuretic
caf·fein·ic \ka-ˈfē-nik, ˌkaf-ē-ˈin-ik\ adjective

caffeine

noun    (Concise Encyclopedia)

Heterocyclic compound that, like other alkaloids, has marked physiological effects. It occurs in coffee beans, tea leaves, kola nuts, cacao, maté, and guarana and in the products made from them. Its stimulating effect on the central nervous system, heart, cardiovascular system, and kidneys makes it medically useful in treating respiratory depression caused by overdose of barbiturates, morphine, or heroin. Its positive effects can include improved motor performance, decreased fatigue, increased alertness, and enhanced sensory activity. Excessive caffeine can produce irritability, anxiety, insomnia, and potentially serious symptoms such as heart irregularities and delirium. Much of the caffeine included in many over-the-counter stimulants, cold remedies, and painkillers has been extracted during production of decaffeinated coffee and tea.

Browse

Next Word in the Dictionary: caffeine citrate
Previous Word in the Dictionary: caffeinated
All Words Near: caffeine

Seen & Heard

What made you want to look up caffeine? Please tell us where you read or heard it (including the quote, if possible).

Get Our Free Apps
Voice Search, Favorites,
Word of the Day, and More
Join Us on FB & Twitter
Get the Word of the Day and More