[ney-tuh-tawr-ee-uhm, -tohr-, nat-uh-]
noun, plural natatoriums, natatoria [ney-tuh-tawr-ee-uh, -tohr-, nat-uh-] .
a swimming pool, especially one that is indoors.

1885–90; < Late Latin natātōrium swimming place, equivalent to Latin natā(re) to swim + -tōrium -tory2 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
natatorium (ˌneɪtəˈtɔːrɪəm)
n , pl -riums, -ria
rare a swimming pool, esp an indoor pool
[C20: from Late Latin: swimming place, pool]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1890, New Englandish word for "swimming pool," from L. natator "swimmer" (from nare "to swim") + -ium, neut. suffix. Latin nare is from PIE *sna- "to swim, to flow" (cf. Arm. nay "wet, liquid;" Gk. notios "damp, moist," nao "I flow;" Skt. snati "bathes;" M.Ir. snaim "I swim;" and probably also Gk. nesos
"island," from *na-sos, lit. "that which swims").
Online Etymology Dictionary, © 2010 Douglas Harper
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