polyandry
noun [ U ] uk/ˌpɒl.iˈæn.dri/ us/ˌpɑː.liˈæn.dri/
social science specialized一妻多夫（制）
the practice of having more than one husband or permanent male sexual partner at the same time
biology specialized（动物）一雌多雄
the practice of a female animal having more than one male mate (= sexual partner)
Compare: polygyny
See also: polygamy