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
Jane E. Brody antiestrogenic adjective
or British antioestrogenic
ˌan-tē-ˌe-strə-ˈje-nik
ˌan-tī-,
British -ˌē-
antiestrogenic agents
an antiestrogenic effect
Word History
First Known Use
1965, in the meaning defined above
Medical Definition
antiestrogen
noun
an·ti·es·tro·gen
variants or chiefly British antioestrogen
-ˈes-trə-jən, British -ˈēs-
: a substance (as tamoxifen) that inhibits the physiological action of an estrogen