Definition of ricin
: a poisonous protein in the castor bean
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Recent Examples of ricin from the Web
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The court filing does not state what authorities believe Gibbs intended to do with the ricin.
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Investigators found the ricin in a container that was double wrapped with plastic bags.
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Investigators also found castor beans, which naturally produce ricin, and a jar labeled as containing botulism.
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The tip of the umbrella had been laced with ricin, a deadly poison, and Markov later died.
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News sources are now reporting that this message has tested positive for ricin.
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Schmidtke gave the meat to Animal Services to be tested, and the results came back positive for ricin, authorities said.
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The $143 million Fort Detrick laboratory, which opened just seven years ago, has been used by the FBI to test substances in high-profile cases, including a letter sent to the White House in 2013 that contained the deadly compound ricin.
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And in one case, a Bulgarian dissident, Georgi Markov, was killed on Waterloo Bridge in London in 1978 with an umbrella tipped with a pellet of ricin.
These example sentences are selected automatically from various online news sources to reflect current usage of the word 'ricin.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.
Origin and Etymology of ricin
Latin ricinus castor-oil plant
Medical Dictionary
medical Definition of ricin
: a poisonous protein in the castor bean
Learn More about ricin
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Britannica.com: Encyclopedia article about ricin
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