antiestrogen
noun
an·ti·es·tro·gen
ˌan-tē-ˈe-strə-jən
ˌan-tī-,
British -ˈē-
variants
or British antioestrogen
: a substance (such as tamoxifen) that inhibits the physiological action of an estrogen
… acts like an antiestrogen in breast and uterine tissue, thus protecting against hormone-stimulated cancers …—Jane E. Brody
antiestrogenic
adjective
or British antioestrogenic
antiestrogenic agents
an antiestrogenic effect
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Merriam-Webster unabridged
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