/ Dictionary / Index N natatorium: Meaning and Definition of Find definitions for: na•ta•to•ri•um Pronunciation: (nā"tu-tôr'ē-um, -tōr'-, nat"u-), [key] — pl. -to•ri•ums, -to•ri•a a swimming pool, esp. one that is indoors. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: natatorium (Thesaurus) natatorial natch Related Content Daily Word Quiz: spectral Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language