mifepristone

noun

mi·​fep·​ris·​tone ˌmi-fə-ˈpri-ˌstōn How to pronounce mifepristone (audio)
mi-ˈfe-pri-ˌstōn
: a drug C29H35NO2 taken orally to induce abortion especially early in pregnancy by blocking the body's use of progesterone

called also RU-486

Examples of mifepristone in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
In December, 2021, the F.D.A. had lifted its requirement that mifepristone be prescribed in person; the number of virtual clinics, which assess a patient’s eligibility online or by phone, and mail out the medications, proliferated. Margaret Talbot, New Yorker, 14 Apr. 2025 Democrats hammered Makary during his confirmation hearing on recent moves by the Trump administration to cut FDA staff and pressed him on plans to exercise his authority over mifepristone. Nathaniel Weixel, The Hill, 26 Mar. 2025 The clinics help out-of-state patients in two ways: by mailing them mifepristone and misoprostol, and by treating patients who travel to Maine for care. Rosemary Westwood, NPR, 19 Mar. 2025 The plan makes calls to invoke the 150-year-old federal Comstock Act in order to prosecute providers who send mifepristone by mail. Katy Golvala, Hartford Courant, 27 Feb. 2025 See All Example Sentences for mifepristone

Word History

Etymology

perhaps from amino + fe- (alteration of phen-) + pri- (alteration of prop-) + estradiol + -one

First Known Use

1985, in the meaning defined above

Time Traveler
The first known use of mifepristone was in 1985

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Cite this Entry

“Mifepristone.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/mifepristone. Accessed 5 Jun. 2025.

Medical Definition

mifepristone

noun
mi·​fep·​ris·​tone ˌmi-fə-ˈpris-ˌtōn How to pronounce mifepristone (audio) mi-ˈfep-ri-ˌstōn How to pronounce mifepristone (audio)
: a drug C29H35NO2 taken orally to induce abortion especially early in pregnancy by blocking the body's use of progesterone

called also RU-486

More from Merriam-Webster on mifepristone

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