body (of a biwa)
「槽」 has another reading with different meanings.
ship; boat; watercraft; vessel; seaplane
biwa (Japanese lute)
水を入れる槽を用意した。
I prepared a trough for water.
この槽は木でできている。
This trough is made of wood.
工場には大きな槽がいくつも並んでいた。
There were many large tubs lined up in the factory.