natatorium
noun
a swimming pool, especially one that is indoors.
The grammatical form denoting more than one person, place, thing, or idea.
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
Subterranean natatoria: A peek at some of New York City’s private pools.
From New York Times ● Sep. 3, 2022