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

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

antiestrogenic adjective

or chiefly British antioestrogenic

-ˌes-trə-ˈjen-ik, British -ˌēs- 

antiestrogenic agents