women's room

noun2

1. •
   (historical) A waiting room in a railway station or other public building intended exclusively for women and usually including a separate women's lavatory.
2. •
   (US, euphemistic) Synonym of ladies' room: a public restroom intended for females.

   • Women were expected to use the toilet provided for the general public... Plans have been made for a women's room at this station. — 1918