nonwife

English

Etymology

From non- +‎ wife.

Noun

nonwife (plural nonwives)

1. One who is not a wife; a woman who stands in a relationship to somebody other than that of a wife.
   • 2001, Steven Suskin, Broadway Yearbook, 1999-2000:

     Pascal's estate was contentiously split between his ex-wife and his nonwife, with artistic decisions ultimately empowered to a banker.