caffeine

CEFRB2

/ˈkæfiːn/

noun

Türkçe translations

Translating…

In plain English

  1. 01

    noun

    A substance in coffee and tea that makes people more alert.

  2. 02

    noun

    Extra detail

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

Examples

  • Caffeine is a purinergic antagonist that competitively inhibits adenosine at the sites of P1 receptors.

  • I've been trying to cut down on caffeine.

At a glance

Sits at B2 on the CEFR scale

Senses
2
Parts of speech
1
Citations
3

Deep Dive

More examples

In context

  • Masha prefers coffee without caffeine.

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

  • The US Food and Drug Administration defines this limit as anything more than 400 milligrams of caffeine daily for healthy adults. This is equivalent to four or five cups of coffee.

Quick test

Two questions on this entry. Nothing is scored.

Question 1 · Quick check

This energy drink contains a high amount of blank, which keeps me alert.

Practise this properly in the app, where the word comes back before you forget it.

Nearby

Origin

noun

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.