Bathroom (noun)

1. A room containing a bathtub or shower and usually also a toilet and sink.
2. A room or area containing a toilet.

Origin:

Early 18th century: from bath + room.

Examples:

1. He needed to go to the bathroom.
2. She was getting ready in the bathroom.
3. The bathroom had a shower and a bathtub.
4. He was fixing the bathroom sink.
5. The guest bathroom was next to the bedroom.