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natatorium

[ney-tuh-tawr-ee-uh m, -tohr-, nat-uh-] /ˌneɪ təˈtɔr i əm, -ˈtoʊr-, ˌnæt ə-/
noun, plural natatoriums, natatoria
[ney-tuh-tawr-ee-uh, -tohr-, nat-uh-] /ˌneɪ təˈtɔr i ə, -ˈtoʊr-, ˌnæt ə-/ (Show IPA)
1.
a swimming pool, especially one that is indoors.
Origin
1885-1890
1885-90; < Late Latin natātōrium swimming place, equivalent to Latin natā(re) to swim + -tōrium -tory2
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for natatoria

natatorium

/ˌneɪtəˈtɔːrɪəm/
noun (pl) -riums, -ria (-rɪə)
1.
(rare) a swimming pool, esp an indoor pool
Word Origin
C20: from Late Latin: swimming place, pool
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for natatoria
natatorium
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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