Synonyms

mifepristone

American

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

noun

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

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.

Corcept has one marketed product, called Korlym, which is a presentation of the drug mifepristone used to control hyperglycemia in certain patients with Cushing syndrome.

From Barron's • Dec. 31, 2025

The FDA authorized a generic form of mifepristone, a 200-milligram oral tablet, on Tuesday from Evita Solutions, according to a letter posted on the agency’s website.

From The Wall Street Journal • Oct. 2, 2025

A Comstock claim even figured centrally in the Supreme Court’s recent mifepristone case, Food and Drug Administration v.

From Slate • Aug. 22, 2024

Under the new law, mifepristone and misoprostol will be added to a list comprised of opioids, depressants, and stimulants.

From Salon • Jul. 25, 2024

In 2000, the FDA approved the use of mifepristone as safe and effective for ending an early pregnancy.

From Los Angeles Times • Jun. 13, 2024

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023