caffeine

== English == === Alternative forms === caffein (dated) === Etymology === 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. === Pronunciation === IPA(key): /ˈkæfiːn/, /kæˈfiːn/ Rhymes: -æfiːn, -iːn === Noun === caffeine (usually uncountable, plural caffeines) An alkaloid, C8H10N4O2, found naturally in tea and coffee plants, which acts as a mild stimulant on the central nervous system. [from 1830] Coordinate terms: guaranine, mateine, theine ==== Derived terms ==== ==== Translations ==== === References === === Further reading === caffeine on Wikipedia.Wikipedia == Italian == === Noun === caffeine f pl plural of caffeina