The phrase "bathing tub" refers to a container or object used for taking a bath or washing oneself. It is used to describe a bathtub or a large basin where a person can sit or lie down to clean their body. Full definition
Fill the baby bath tub with warm water about five inches or enough to allow your baby to settle in the water with his shoulders well covered. (newbornbabyzone.com)
The third bedroom is outfitted with a king bed, large screen television and an ensuite bathroom with bath tub with shower, toilet and sink. (wyndhamvacationrentals.com)
Very obvious questionable stain on bed throw, clear dirty marks in bath tub and hair on floor near the chair. (accorhotels.com)