mifepristone

noun

mi·​fep·​ris·​tone ˌmi-fə-ˈpri-ˌstōn 

mi-ˈfe-pri-ˌstōn

: a drug C₂₉H₃₅NO₂ taken orally to induce abortion especially early in pregnancy by blocking the body's use of progesterone

called also RU-486

Examples of mifepristone in a Sentence

Recent Examples on the Web

If the justices decide the case in Louisiana's favor then mifepristone would no longer be available via telemedicine nationally. — Selena Simmons-Duffin, NPR, 25 June 2026

Misoprostol clears all pregnancy tissue in roughly 85% to 90% of cases, versus 95% when paired with mifepristone. — Rachel Rebouché, The Conversation, 23 June 2026

The ruling also banned filling a prescription for mifepristone at a retail pharmacy. — Amy Hagstrom Miller, Washington Post, 9 June 2026

Pay no attention to the fact that it was proposed three weeks after the EPA came out hard against three-eyed fish, or that only three months ago, this same Legislature considered $100,000 court payouts to snitches willing to rat out mifepristone providers. — Pat Beall, Sun Sentinel, 29 May 2026

Word History

Etymology

perhaps from amino + fe- (alteration of phen-) + pri- (alteration of prop-) + estradiol + -one

First Known Use

1985, in the meaning defined above

Rhymes for mifepristone

• aldosterone
• anticyclone
• hydrocodone
• progesterone
• testosterone
• acetone
• anglophone
• baritone
• bourguignon
• buspirone
• chaperon
• chaperone

Medical Definition

mifepristone

noun

mi·​fep·​ris·​tone ˌmi-fə-ˈpris-ˌtōn  mi-ˈfep-ri-ˌstōn 

: a drug C₂₉H₃₅NO₂ taken orally to induce abortion especially early in pregnancy by blocking the body's use of progesterone

called also RU-486