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Caffeine

//ˈkæfiːn// noun

Definitions

Noun
  1. 1
    An alkaloid, C₈H₁₀N₄O₂, found naturally in tea and coffee plants, which acts as a mild stimulant on the central nervous system. uncountable, usually

    "For example, 0.100 grams of caffeine yield by combustion, by weight, 0.180 grammes of carbonic acid."

  2. 2
    a bitter alkaloid found in coffee and tea that is responsible for their stimulating effects wordnet

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.

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