What two women call each other when they find out that they are married to the same man.
When Heidi went to pick up a marriage application at the court house, she found out that she was still legally married. So, she called her friend and their husband and let them know. The "other" wife said, we are wife-in-laws.
Aa term relating one woman in a relationship to all the other women her partner is having relations with. Sometimes refers to the type of woman who attempts to control the children of the other woman, or otherwise control the partner's family unit.