noun
indoor bath; private bath
Refers to a bath inside a private home, as opposed to a public bath (外風呂) or sento. Often implies a bath used only by the family.
このアパートには内風呂がついています。
This apartment comes with a private bath.
内風呂と外風呂、どちらが好きですか。
Which do you prefer, an indoor bath or an outdoor bath?
銭湯 is a public bathhouse where anyone can pay to enter, whereas 内風呂 is a private bath for personal or family use.
Compound of 内 (uchi, 'inside') and 風呂 (furo, 'bath'). The reading うちぶろ is a straightforward combination of the kun'yomi of 内 and the on'yomi of 風呂.