(nonstandard) Alternative form of men's room: a public lavatory intended for men.

(television) The room in which the showrunner and the writers of a television series collaborate on the plot and develop the script.

(informal) Person(s) present in a passive way or to make up the numbers; bystander(s).

A distorted room designed to be viewed through a pinhole, using a trick of perspective to create an optical illusion so that people standing in opposite corners appear to be of very different sizes.

(euphemistic, rare) A lavatory: a room intended for urination and defecation. / Used other than figuratively or idiomatically: see small, room.

(historical) A waiting room in a railway station or other public building, often including a separate lavatory. / (euphemistic, dated) Synonym of men's room: a public lavatory intended for men.

(uncommon) Alternative form of bathroom in its various senses.

Alternative form of cloakroom: a room for storing outerwear; a lavatory.

Alternative form of toilet room: a room for grooming; a lavatory.

(historical) A room in which to perform one's toilet, including dressing and grooming, particularly before execution. / (originally US euphemistic) A room in which to use a toilet: a lavatory.