Open Dictionary
mouse here to listen, click to choose/add more
Location: USA
Source: Learn That Word
Profile URL: www.learnthat.org

Are you a native English speaker? How do you pronounce this word?

Thank you for contributing!
upload mp3 file or record now it's easy, promised!

{%type%} Definitions

WordNet 3.0Copyright Princeton University
{%wordnet%}
Definitions.net
{%definitions_com%}

Videos

Short "hint"

n. - A bitter alkaloid found in coffee and tea that is responsible for their stimulating effects.

edit
Usage examples (27)
  • Certain trees growing wild in the Comoro Islands and Madagascar are known as caffein-free coffee trees.
  • I'm incredibly caffein sensitive and I can drink it before napping.
  • I, too, cannot have breakfast without having a rush of caffein intake first.
  • The caffein or theine in tea is an alkaloid that has characteristic physiological properties.
...click for more
Tutoring comment


Tutoring comment not yet available...

add more
The Open Dictionary of English is a collaborative project, based on Open Source materials, LearnThat resources, and partner APIs.
We give special thanks to our LearnThat volunteers, as well as Princeton University and Wiktionary for their Open Source word data. We're also grateful for the support given by Google, Wordnik.com, Dictionary.com, Stands4.com and YouTube, OEDILF.com, Kylescholz.com, Best-Practice.com, Forvo.com, as well as the generous Creative Commons community.