rest room

or rest·room


noun

rooms or a room having a washbowl, toilet, and other facilities for use by employees, visitors, etc., as in a store, theater, or office.

Origin of rest room

An Americanism dating back to 1895–1900

Example sentences from the Web for restroom

British Dictionary definitions for restroom

rest room

noun

a room in a public building having lavatories, washing facilities, and sometimes couches