die Badewanne
bathtub
A large, long basin in the bathroom that is filled with water so someone can bathe in it.
Nach dem Sport entspanne ich am liebsten in einer heissen Badewanne.
After exercising, I like best to relax in a hot bathtub.

bathtub
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bathtub
A large, long basin in the bathroom that is filled with water so someone can bathe in it.
Nach dem Sport entspanne ich am liebsten in einer heissen Badewanne.
After exercising, I like best to relax in a hot bathtub.

The word is a simple compound made from 'Bade-' (from the verb 'baden' — to bathe) and 'Wanne' (a container, tub). So it is literally a 'tub for bathing.'
Die Kinder lieben es, in der Badewanne mit Schaum zu spielen.
The children love playing with foam in the bathtub.
Pay attention to the case after the preposition 'in.' For direction, you use the accusative ('in die Badewanne steigen' — to step into the bathtub); for location, the dative ('in der Badewanne liegen' — to lie in the bathtub).
Er steigt vorsichtig in die heisse Badewanne.
He carefully steps into the hot bathtub.
Two typical actions are 'ein Bad nehmen' (to take a bath) and 'eine Badewanne einlassen' (to fill the bathtub with water).
Ich lasse mir jetzt eine heisse Badewanne ein.
I'm going to run myself a hot bath now.
basin / pelvis / cymbal
'das Becken' and 'die Badewanne' can both mean an open container that holds water. However, 'Becken' is more general: it can be a 'Waschbecken' (washbasin), a 'Schwimmbecken' (swimming pool), or another kind of water basin. 'Badewanne' is more specific and means the long basin in the bathroom that you bathe in. Learners may confuse the words because a bathtub is a kind of basin. In the bathroom, though, 'Badewanne' sounds more natural when talking about bathing; 'Becken' fits better when speaking generally about the shape or function.

Nach dem langen Spaziergang legt sich Anna in die warme Badewanne.
After the long walk, Anna lies down in the warm bathtub.
Im Schwimmbad ist das große Becken heute wegen der Reinigung geschlossen.
At the swimming pool, the large pool is closed today for cleaning.