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.

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mifepristone British  

/ mɪˈfɛprɪˌstəʊn /

noun

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

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Etymology

Origin of mifepristone

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

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Example Sentences

See Examples For:

mifepristone

There are any number of unknowns, but one thing is clear: A majority of the justices ruled that mifepristone access should remain unchanged during litigation in the case.

From Slate ● Sep. 16, 2026

However, when federal regulators previously reviewed environmental concerns related to mifepristone, they found no evidence warranting restrictions, according to Bernstein.

From Salon ● Jul. 6, 2026

Nathan Donley, the environmental health science director at the Center for Biological Diversity, pointed out that mifepristone is used by a small fraction of the population and is typically taken as a one-time dose.

From Salon ● Jul. 6, 2026

In addition to the FDA study using the agency’s own drug safety systems, the agency is also considering hiring a contractor to acquire and analyze data on mifepristone use, the administration officials said.

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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