Bathtub; the tub or basin used for bathing (where water is filled to bathe).
浴槽にお湯を張ってから入る。
I fill the bathtub with hot water before getting in.
古い浴槽は滑りやすいので注意してください。
Be careful because the old bathtub is slippery.
浴槽の栓が壊れて水が抜けない。
The bathtub plug is broken and the water won't drain.