private bath; reserved bath
Refers to a bath (typically in a shared facility like a ryokan or sento) that is reserved for one person or group's exclusive use during a set time.
I reserved a private bath at the ryokan.
家族でゆっくり入れるように、留め風呂にした。
We chose a reserved bath so the family could relax together.
Standard spelling for a bath reserved for one's exclusive use.
Abbreviated spelling; less common but still used.
Compound of 留め (tome, 'stopping' or 'reserving') + 風呂 (furo, 'bath'). The term likely originates from the practice of 'stopping' a bath for private use in communal bathing facilities.