Definition of caffeine in English:


Line breaks: caf|feine
Pronunciation: /ˈkafiːn


[mass noun]
  • An alkaloid compound which is found especially in tea and coffee plants and is a stimulant of the central nervous system.
    • chemical formula: C8H10N4O2
    More example sentences
    • The stimulant effects of caffeine in coffee are well known to help improve energy and alertness.
    • They have a similar effect to tea or coffee, since they contain the same alkaloid, caffeine.
    • In flowering plant pollen tubes, caffeine disrupts vesicle zonation at the tip and stops elongation.


mid 19th century: from French caféine, from café 'coffee'.

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