caffeine
UK: ˈkæfiːn | US: ˈkæfiːn
n. a bitter alkaloid found in coffee, tea, and other plants, acting as a stimulant to the central nervous system.
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The word caffeine originates from the French caféine, derived from café (coffee). The root caffe traces back to the Arabic qahwa, referring to coffee. The suffix -ine is a chemical nomenclature suffix used for alkaloids and other compounds (e.g., morphine, quinine). The term was coined in the early 19th century when caffeine was first isolated from coffee beans, reflecting its chemical identity and natural source.
Caffeine is the primary stimulant in coffee and tea.
Many people rely on caffeine to stay alert during long work hours.
Excessive caffeine intake can lead to insomnia and nervousness.
Decaffeinated coffee has most of its caffeine removed.
Some energy drinks contain high levels of caffeine.