natatorium

Etymology
Borrowed from, noun use of the neuter singular of. Equivalent to.

Noun

 * 1)  A swimming pool, especially an indoor one; a building housing one or more swimming pools.
 * 2) * 2006,, , New York, N.Y.: Penguin Press, ISBN 978-1-59420-120-2 ; republished London: , 2007, ISBN 978-0-09-951233-2 , page 226:
 * A sunken chamber almost like a natatorium at some hot-springs resort, so cool and dim that you forgot after a while about the desert waiting out there to resume for you as soon as you stepped back into it.
 * 1) * 2006,, , New York, N.Y.: Penguin Press, ISBN 978-1-59420-120-2 ; republished London: , 2007, ISBN 978-0-09-951233-2 , page 226:
 * A sunken chamber almost like a natatorium at some hot-springs resort, so cool and dim that you forgot after a while about the desert waiting out there to resume for you as soon as you stepped back into it.
 * 1) * 2006,, , New York, N.Y.: Penguin Press, ISBN 978-1-59420-120-2 ; republished London: , 2007, ISBN 978-0-09-951233-2 , page 226:
 * A sunken chamber almost like a natatorium at some hot-springs resort, so cool and dim that you forgot after a while about the desert waiting out there to resume for you as soon as you stepped back into it.