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

The challenge is backed by Alliance Defending Freedom, which represents Louisiana and wants the Food and Drug Administration to restore in-person requirements for the dispensing of mifepristone. — Kaelan Deese, The Washington Examiner, 10 Sep. 2026

Three other three-judge panels on the 5th Circuit -- one in this case and two in an earlier one -- and two district courts have already agreed that rules for prescribing mifepristone are too loose. — Arkansas Online, 10 Sep. 2026

The 5th Circuit Court of Appeals ruled in favor of the state in May, barring dispensation of mifepristone by telehealth providers and by pharmacies or mail, but the Supreme Court preserved access to the pill, keeping the lower court's order on hold. — Mary Kekatos, ABC News, 9 Sep. 2026

Mehdizadeh specifically highlighted the targeting of access to the medication mifepristone. — Larisha Paul, Rolling Stone, 22 July 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