Definition of "ricin" []

• A poisonous protein extracted from the castor bean and used as a biochemical reagent. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "I was listening to people just last night, and, really, they weren't able to articulate the name ricin, and listen to do a group of people trying to explain it to others, what ricin was."
• "I wonder whether the Chilcot inquiry Report, 29 January will require Tony Blair to answer a question or two about the so-called ricin plot."
• "Free for a few years, he was then imprisoned for 2½ years accused of involvement in the so-called ricin plot."