ricin

noun

ri·​cin ˈrī-sᵊn How to pronounce ricin (audio)
ˈri-
: a poisonous protein in the castor bean

Examples of ricin in a Sentence

Recent Examples on the Web
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Craven struggles to recall all of the cases she's had a hand in, but a few come to mind, like a criminal case involving a New Boston, Texas, woman who sent letters laced with poisonous ricin to the U.S. president and others. Arkansas Online, 31 May 2022 In 2018, a letter that claimed to contain ricin led to a full biohazard response by first responders at her home. Fox News, 11 May 2022 In his truck, officers found a plastic water gun and five tubes that tested positive for ricin. Amanda Rabines, Orlando Sentinel, 10 May 2022 The seed for Saaem’s ricin idea didn’t involve him at all. Washington Post, 5 Apr. 2022 See All Example Sentences for ricin

Word History

Etymology

Latin ricinus castor-oil plant

First Known Use

1896, in the meaning defined above

Time Traveler
The first known use of ricin was in 1896

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Cite this Entry

“Ricin.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/ricin. Accessed 10 Sep. 2025.

Medical Definition

ricin

noun
: a poisonous protein in the castor bean

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