'restroom' originates from the English words 'rest' and 'room', where 'rest' meant 'to relax' and 'room' meant 'a space or area'.

'restroom' was coined in the early 20th century in the United States as a more polite term for 'toilet' or 'lavatory'.

Initially, it referred to a place to rest, but over time it evolved into its current meaning of a public toilet facility.