Lavatory (noun)

1. A room or area equipped with facilities for washing and usually with toilets.
2. A sink or basin for washing, especially one in a bathroom or public restroom.

Origin:

From latin 'lavatorium' meaning 'a place for washing'.

Examples:

1. The public lavatory was equipped with soap, towels, and a changing table for babies.
2. The passengers on the flight were relieved to find a clean and well-maintained lavatory on board.
3. The lavatory on the train was not functioning and the passengers had to wait for the next stop.
4. The host offered to show the guests to the lavatory before dinner was served.
5. The lavatory sink was clogged and the plumber was called to fix the problem.