wife-in-law

noun3

1. •
   Another wife of one's husband. Typically used in cases of divorce and subsequent remarriage for one's husband's ex-wife, but sometimes used in polygamy for a co-wife.

   • Many husbands, like the wives-in-law themselves, were deeply divided and upset over a family life that could no longer be defined as a single unit. — 1994
2. •
   A wife in law only, such as one who has abandoned her husband
3. •
   A wife who provides domestic or social support, but not love or affection