rest room

WordReference Random House Learner's Dictionary of American English © 2026

ˈrest ˌroom, n. [countable]

1. a public lavatory, esp. in a public building, having washbasins, toilets, etc.

WordReference Random House Unabridged Dictionary of American English © 2026

rest′ room′, 

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

Also, rest′room′. 

• 1895–1900, American.