From Longman Dictionary of Contemporary Englishbathtubbath‧tub /ˈbɑːθtʌb $ ˈbæθ-/ ●●○ noun [countable] DHH especially American English a long large container that you fill with water and sit or lie in to wash yourself SYN bath British English
Examples from the Corpus
bathtub• Science finds that a surface tension on the water can draw the boats together, like toy boats in a bathtub.• When they arrived, the little boy was lying on the steps leading to a bathtub.• They come fully equipped with beds, furniture, bathtubs and cooking utensils.• He also found five fish swimming in murky water in an old bathtub.• She got it her or she was in the or she was in the bathtub.• I placed you in the bathtub and turned on the water.• Al Capone and bootleggers filled the vacuum: bathtub spirits, peepholes in the door, Joe-sent-me. 