natatorium

noun

1. (US)A swimming pool, especially an indoor one; a building housing one or more swimming pools.

   “[page 124] Although the five public natatoriums in Milwaukee now accommodate about 1,200,000 bathers per annum, they are capable of serving 400,000 more people a year than at present. […] [page 126] [O]ne of the best ways to reform an unruly gang is to get them to be devoted to a vigorous, manly man. There seems to be very little of this spirit in the present natatoriums. This is due in part to the swarms in which the boys come to the pool whenever it is open to them.”

   “Although the public does not pay an admission fee for the privilege of using natatoria facilities, the city charges ten cents for towels and soap, and ten cents for the rental of swimming trunks and bathing suits. In 1948 total revenues were $20,284 from this source for all natatoria.”

   “THE WAIKIKI NATATORIUM'S FIRST EVENT. An outdoor, oceanside pool was envisioned as part of the Waikiki War Memorial Park, which honored Hawaii's soldiers killed in World War I. […] In 1927 the facility opened and became known as the Waikiki Natatorium. The 40 × 110-yard Natatorium was the world's largest open-ocean swim stadium.”

   “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. […]”