castor oil


Definition of castor oil

: a pale viscous fatty oil from castor beans used especially as a cathartic and as a lubricant and plasticizer

Examples of castor oil in a Sentence

Recent Examples on the Web Each packet contains eight seeds, and ricin is a poison that can be extracted from the seeds of the castor oil plant. Mike Brest, Washington Examiner, "Pennsylvania man charged with obstruction after allegedly attempting to purchase ricin," 17 Mar. 2021 Curiously, the seeds also contain castor oil that is not toxic when it is heated during the extraction process. Steve Bender, Southern Living, "Six Deadly Plants for Dogs and Cats," 22 Mar. 2021 Available to Canadians directly from the website, this beard oil features natural ingredients and a blend of castor oil, jojoba oil and argan oil to soften unruly hair. Fiona Tapp, CNN Underscored, "All the products you need to care for your lockdown facial hair," 5 Mar. 2021 Among the crops that Currie says could be easily brought under the umbrella of sustainable development are ginger, breadfruit, yams, castor oil, sorrel, potatoes, peppers, bananas, plantains and turmeric. Daphne Ewing-chow, Forbes, "Sovereignty And The Soil: Chief Richard Currie And The Rising Of The Maroon Nation In Jamaica," 28 Feb. 2021 This stick foundation is easy to apply, offers buildable coverage, and moisturizes thanks to sodium hyaluronate, castor oil, and grape seed oil. Akili King, Vogue, "15 of the Best Foundations for Dry Skin to Try This Winter," 9 Dec. 2020 Petrillo recommends ingredients such as castor oil, ceramides, shea butter, or avocado oil. Madge Maril, Harper's BAZAAR, "Why Your Lips are Always Dry and Chapped," 24 Nov. 2020 The sentence said ricin is part of the waste produced when castor oil is made. Adrian Vore, San Diego Union-Tribune, "The story behind newspaper corrections," 9 Oct. 2020 Applying straight castor oil may lead to skin irritation, inflammation, and dryness. Jessica Teich, Good Housekeeping, "The Skincare Dictionary: Every Ingredient Explained," 2 Oct. 2020

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'castor oil.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of castor oil

1746, in the meaning defined above

History and Etymology for castor oil

probably from its former use as a substitute for castoreum in medicine

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Time Traveler for castor oil

Time Traveler

The first known use of castor oil was in 1746

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Statistics for castor oil

Last Updated

7 Apr 2021

Cite this Entry

“Castor oil.” Dictionary, Merriam-Webster, Accessed 10 Apr. 2021.

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More Definitions for castor oil

castor oil


English Language Learners Definition of castor oil

: a thick oil made from a tropical plant and used in the past as a medicine

castor oil

cas·​tor oil | \ ˈka-stər- \

Kids Definition of castor oil

: a thick yellowish liquid that comes from the seeds ( castor beans ) of a tropical herb and is used as a lubricant and as a strong laxative

castor oil


Medical Definition of castor oil

: a pale viscous fatty oil from castor beans used especially as a cathartic or lubricant

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