Definitions of mifepristone [ˌmɪf əˈprɪs toʊn]

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Definition of 'mifepristone'

Random House Webster's College Dictionary

1. (n.) mifepristone
an antigestational drug that prevents a fertilized egg from attaching to the uterine wall by blocking the action of progesterone.

Etymology: (1985–90; prob. alter. of (a)mi(no)phe(nol) +pr(opyl) +est(radiol) +-one)

Definition of 'mifepristone'

Princeton's WordNet

1. (noun) abortion pill, mifepristone, RU 486
an abortion-inducing drug (trade name RU_486) developed in France; when taken during the first five weeks of pregnancy it blocks the action of progesterone so that the uterus sloughs off the embryo

Definition of 'mifepristone'

U.S. National Library of Medicine

1. mifepristone
A progestational and glucocorticoid hormone antagonist. Its inhibition of progesterone induces bleeding during the luteal phase and in early pregnancy by releasing endogenous prostaglandins from the endometrium or decidua. As a glucocorticoid receptor antagonist, the drug has been used to treat hypercortisolism in patients with nonpituitary CUSHING SYNDROME.

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