MESTRANOL Meaning of MESTRANOL in English ˈmestrəˌnȯl, -ˌnōl noun( -s )Etymology: m eth- + estr ogen + pregn an e + -ol (I): a synthetic estrogen C 21 H 26 O 2 used in oral contraceptives Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012