castor oil
noun
: a pale viscous fatty oil from castor beans used especially as a cathartic and as a lubricant and plasticizer
Example Sentences
Recent Examples on the Web The polymer used in this ski boot comes from castor oil, which is extracted from a non-edible crop. 
Outside Online, 9 Mar. 2022 Infused with growth-enhancing ingredients like hyaluronic acid, collagen, and castor oil, eyelash serums work to improve the condition and length of eyelashes. Jasmine Washington, Seventeen, 1 Aug. 2022 Combined with the biotin in the shampoo and the castor oil in the treatment, the vitamin C works to nourish hair and encourage new growth. Grooming Playbook, The Salt Lake Tribune, 6 Apr. 2022 Their best seller, Forbidden Oil, combines coffee seed oil and castor oil to promote hair growth. Katarina Avendano, Good Housekeeping, 3 Aug. 2022 With black castor oil and biotin, healthier curls are just a few spritzes away. ELLE, 27 June 2022 Lastly, the collection features a slightly shimmering serum, which can act as a primer, a highlighter, and a skincare product thanks to its cocktail of hyaluronic acid, castor oil, and glycerin. ELLE, 28 June 2022 The idea of drenching your hair in oil may sound a bit suspect, but castor oil, jojoba oil, rosemary oil and argan oil have all made their way into hair care routines for their restorative benefits. Jacqueline Saguin, Good Housekeeping, 24 June 2022 Formulated with aloe vera, castor oil, and glycerin, the lightweight mask removes oil and impurities, leaving skin moisturized and supple. Lindsey Greenfeld, PEOPLE.com, 1 June 2022 See More
Outside Online, 9 Mar. 2022 Infused with growth-enhancing ingredients like hyaluronic acid, collagen, and castor oil, eyelash serums work to improve the condition and length of eyelashes. Jasmine Washington, Seventeen, 1 Aug. 2022 Combined with the biotin in the shampoo and the castor oil in the treatment, the vitamin C works to nourish hair and encourage new growth. Grooming Playbook, The Salt Lake Tribune, 6 Apr. 2022 Their best seller, Forbidden Oil, combines coffee seed oil and castor oil to promote hair growth. Katarina Avendano, Good Housekeeping, 3 Aug. 2022 With black castor oil and biotin, healthier curls are just a few spritzes away. ELLE, 27 June 2022 Lastly, the collection features a slightly shimmering serum, which can act as a primer, a highlighter, and a skincare product thanks to its cocktail of hyaluronic acid, castor oil, and glycerin. ELLE, 28 June 2022 The idea of drenching your hair in oil may sound a bit suspect, but castor oil, jojoba oil, rosemary oil and argan oil have all made their way into hair care routines for their restorative benefits. Jacqueline Saguin, Good Housekeeping, 24 June 2022 Formulated with aloe vera, castor oil, and glycerin, the lightweight mask removes oil and impurities, leaving skin moisturized and supple. Lindsey Greenfeld, PEOPLE.com, 1 June 2022 See More Word History
Etymology
probably from its former use as a substitute for castoreum in medicine
First Known Use
1746, in the meaning defined above
Kids Definition
castor oil
noun
cas·tor oil
ˈka-stər-
: 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
Medical Definition
castor oil
noun
: a pale viscous fatty oil from castor beans used especially as a cathartic or lubricant