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[mif-uh-pris-tohn] /ˌmɪf əˈprɪs toʊn/
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.
Origin of mifepristone
1985-90; probably alteration of (a)mi(no)phe(nol) + pr(opyl) + est(radiol) + -one Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for mifepristone
  • The purpose of the study is to examine the effectiveness of mifepristone treatment in patients with refractory depression.
British Dictionary definitions for mifepristone


an antiprogestogenic steroid, used in the medical termination of pregnancy. Formula: C29H35NO2
Word Origin
C20: from aminophenol + propyne + oestradiol + -one
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
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mifepristone in Medicine

mifepristone mi·fep·ri·stone (mĭ-fěp'rĭ-stōn)
RU 486.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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