Definition of natatorium

< natatorial

natch >

na·ta·to·ri·um    (nt-tôr-m, -tr-, nt-) KEY 

NOUN:

An indoor swimming pool.

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ETYMOLOGY:
Late Latin nattrium, place for swimming, from neuter of Latin nattrius, of swimming, from nattus, act of swimming, from past participle of natre frequentative of nre, to swim ; see natatorial