Definition of mifepristone in English:

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Pronunciation: /ˌmɪfɛˈprɪstəʊn/


[mass noun] Medicine
A synthetic steroid that inhibits the action of progesterone, given orally in early pregnancy to induce abortion. Also called RU486 ( trademark).
Example sentences
  • The present study was planned to find a safe, simple and optimally effective regimen of mifepristone and misoprostol for abortion of pregnancy up to 63 days.
  • No studies have specifically compared mifepristone with levonorgestrel.
  • This medication has been shown to be effective for elective abortions and medical termination of pregnancy during the first trimester, leading to studies of the effect of mifepristone in term pregnancies.


1980s: probably from Dutch mifepriston, from mife- (representing aminophenol) + -pr- (representing propyl) + -ist- (representing oestradiol) + -one.

For editors and proofreaders

Line breaks: mife|pris¦tone

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