noun
indoor swimming pool; indoor pool
Refers to a swimming pool located inside a building, as opposed to an outdoor pool (屋外プール).
このホテルには室内プールがあります。
This hotel has an indoor swimming pool.
冬でも室内プールで泳げます。
You can swim in the indoor pool even in winter.
Compound of 室内 (indoor) and プール (pool, from English 'pool').