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

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


Short "hint"

n. - A toxic protein extracted from castor beans.

Usage examples (36)
  • One milligram of ricin can kill an adult
  • Free for a few years, he was then imprisoned for 2½ years accused of involvement in the so-called ricin plot.
  • Freed from its protective hard coating, the inside of the castor bean could be ground into a substance known as ricin.
  • The CDC lists on its Web site that it takes 500 micrograms of ricin, which is about the size of a pinhead, to kill a person. 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,,, and YouTube,,,,, as well as the generous Creative Commons community.