dressing room

Short definition from Wiktionary

Noun

1. 1
   A room used for dressing or changing clothes.
2. 2
   A room used for dressing or changing clothes: A small room adjoining a domestic bedroom where people may dress or undress in privacy.
3. 3
   A room used for dressing or changing clothes: A room in a theatre or other performance venue in which performers may change costumes and apply makeup.
4. 4
   A room used for dressing or changing clothes: A changing room at a recreational or sports venue.
5. 5
   Alternative form of dressing room.