Bathtub (noun)

1. A large container for holding water in which a person can bathe.
2. A container, such as a tub, in which someone takes a bath.

Origin:

Late middle english: from bath + tub.

Examples:

1. She filled the bathtub with warm water and bubbles.
2. He had a long soak in the bathtub after a hard day at work.
3. The baby was splashing and laughing in the bathtub.
4. It's great to relax in the bathtub with a good book.
5. The bathtub was too small for him to stretch out in.