dienestrol

noun

di·​en·​es·​trol ˌdī-ə-ˈnes-ˌtrȯl  -ˌtrōl 

variants or chiefly British dienoestrol

ˌdī-ə-ˈnēs- 

: a white crystalline estrogenic compound C₁₈H₁₈O₂ structurally related to diethylstilbestrol and used topically to treat atrophic vaginitis and kraurosis vulvae