antihormone
an·ti·hor·mone
noun \-ˈhȯr-ˌmōn\Definition of ANTIHORMONE
1
: a fraction of blood globulin that is capable of rendering ineffective a protein-containing heterologous hormone when the latter is administered over a period of time and that is now generally considered to be a true antibody formed in response to the presence of foreign protein
2
: a substance (as tamoxifen) that blocks the action or inhibits the production of a hormone
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