Polyandry
Polyandry is a marriage structure where a woman has more than one husband at one time. Polyandry is Polygamy in which one woman has two or more husbands at the same time. Polyandry is rare, but when it is found there is often fraternal polyandry, in which the husbands are brothers. The term polyandry is also used where a female animal has more than one male mate.
