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mifepristone

American  
[mif-uh-pris-tohn] / ˌmɪf əˈprɪs toʊn /

noun

  1. an antigestational drug, C 29 H 35 NO 2 , that prevents a fertilized egg from attaching to the uterine wall by blocking the action of progesterone.


mifepristone British  
/ mɪˈfɛprɪˌstəʊn /

noun

  1. an antiprogestogenic steroid, used in the medical termination of pregnancy. Formula: C 29 H 35 NO 2

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of mifepristone

1985–90; probably alteration of (a)mi(no)phe(nol) + pr(opyl) + est(radiol) + -one

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

See Examples For:

She said proposals to test wastewater for mifepristone raise concerns about how such monitoring data could eventually be used and whether it could increase scrutiny of people who obtain medication abortions.

From Salon Jul. 6, 2026

He also noted that mifepristone was not included among nearly 700 pharmaceutical compounds the EPA previously screened for potential water contamination concerns.

From Salon Jul. 6, 2026

The FDA website currently says that mifepristone, approved decades ago, is safe to use as indicated.

From The Wall Street Journal Jun. 5, 2026

Former FDA Commissioner Marty Makary, ousted last month, had promised lawmakers he would launch a mifepristone study but told others in the administration that he needed new data systems for the effort.

From The Wall Street Journal Jun. 5, 2026

On this week’s Amicus, Dahlia Lithwick and Mark Joseph Stern dive into the legal battle over mifepristone, the medication that can be used for abortion care.

From Slate May 21, 2026

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