estrinization

noun

es·​trin·​iza·​tion ˌes-trən-ə-ˈzā-shən, -ˌī-ˈzā- 

variants or chiefly British oestrinization

ˌē-strin- 

1

: the uterine and vaginal mucosal alteration characteristic of estrus

2

: treatment with estrogenic substances