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.
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'.

Definition of caffeine in:

Get more from Oxford Dictionaries

Subscribe to remove adverts and access premium resources

Word of the day rebuff
Pronunciation: rɪˈbʌf
reject (someone or something) in an abrupt manner…