Polyandry in Tibet was a common practice and continues to a lesser extent today.
From the en.wikipedia.org
An extreme gender imbalance has been suggested as a justification for polyandry.
From the en.wikipedia.org
Polygyny is permitted in Islam under some conditions, but polyandry is forbidden.
From the en.wikipedia.org
In zoology, polyandry is a mating system involving a female and two or more males.
From the en.wikipedia.org
Polyandry is contrasted with polygyny, involving one male and two or more females.
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The latter situation more closely resembles typical human fraternal polyandry.
From the en.wikipedia.org
Polyandry occurs when one female gets exclusive mating rights with multiple males.
From the en.wikipedia.org
I know more men who are single than women, so the numbers seem to favor polyandry.
From the healthland.time.com
Groups in the Unitarian church demand the blessing of polyandry and polygamy.
From the economist.com
More examples
Having more than one husband at a time
Polyandry (poly- many, andros- man) refers to a form of marriage in which a woman has two or more husbands at the same time. ...
The having of a plurality of husbands at the same time; usually, the marriage of a woman to more than one man, or the practice of having several husbands, at the same time
A form of polygamy and the practice of having more than one male mate at a time. See also Polygyny.
A mating system. A female has several male mates in this breeding system. Females have greater reproductive variance than males'. Polyandry is uncommon. No primate species is purely polyandrous. Some mating relationships in tamarins are polyandrous but most are monogamous. ...
A polygamous mating system involving one female and many males.
[pol EE an drEE, pol EE an-] Marriage practice in which one woman had several husbands; recounted in Aryan epics. (p. 59)
Very rare mating systems of the living primates, a form of polygamy, where one female has multiple sexual male partners (some New World monkeys)
One female has several mates - males help with offspring - marmosets and tamarins