Added 9 October 2026
caffeine
/ˈkæfiːn/ noun
In Latin: coffēinum Wiktionary
noun Definition from WordNet 3.1, Princeton University. Pronunciation from Wiktionary, via Kaikki.org. More about caffeine at Wordnik → Where our words come from →
- A bitter alkaloid found in coffee and tea that is responsible for their stimulating effects.
Origin
Borrowed from French caféine, from café (“coffee”), or German Caffein, Kaffein (cp. Coffein, Koffein), from Kaffee (“coffee”) (cp. Kaffe, Koffee, Koffe), or Italian caffè (“coffee”) + -ine.
From Wiktionary, via Kaikki.org (CC BY-SA)