caffeine
/ˈkæfiːn/
Proposed by a contributor, not yet supported by evidence.
Also seen as: caffeines
Meaning · English
An alkaloid, C₈H₁₀N₄O₂, found naturally in tea and coffee plants, which acts as a mild stimulant on the central nervous system.
Noun
Examples
For example, 0.100 grams of caffeine yield by combustion, by weight, 0.180 grammes of carbonic acid.
Usage example from English Wiktionary (CC BY-SA 4.0, retrieved 2026-08-01)
Sources & notes
Adapted from English Wiktionary (CC BY-SA 4.0, retrieved 2026-08-01 via kaikki.org).
Common questions
What does “caffeine” mean?
An alkaloid, C₈H₁₀N₄O₂, found naturally in tea and coffee plants, which acts as a mild stimulant on the central nervous system.
Is “caffeine” formal or informal?
No register label has been reviewed yet — treat it as neutral and check the usage notes above.