noun
dressing room; powder room
A room for applying makeup and dressing, often in a theater or traditional setting. The gloss 'lavatory' is a dated euphemism; the primary meaning is a room for grooming.
楽屋の隣に化粧部屋がある。
There is a dressing room next to the backstage room.
彼女は化粧部屋で支度を整えた。
She got ready in the dressing room.
Compound of 化粧 (makeup) and 部屋 (room).