Etymology
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natatorium (n.)

1890, a New Englandish word for "swimming pool, place for swimming," from Late Latin natatorium, from Latin natator "swimmer" (from nare "to swim") + -ium, neuter suffix. Latin nare is from PIE root *sna- "to swim." Middle English had natatorie "a pool, bath," early 14c., from Latin.

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Definitions of natatorium

natatorium (n.)
pool that provides a facility for swimming;
Synonyms: swimming pool / swimming bath
From wordnet.princeton.edu