Learn English – What can a wife call her husband’s other wife in polygynous societies

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I am aware that two wives of the same man can be named co-wives. But what can a wife call her husband's other wife? I think calling her my co-wife will not be correct.

Best Answer

Sister wife.

(in a polygamous society) any of the women married to the same man.
‘her mother and her sister wives live in different homes’

Reference:
https://en.oxforddictionaries.com/definition/sister_wife

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