na|ta|to|ri|um

na|ta|to|ri|um «_NAY tuh TR ee uhm, -TOHR-», noun, plural -to|ri|ums, -to|ri|a «-TR ee uh, -TOHR-».

a swimming pool, especially one in a gymnasium or other building.

╂[< Late Latin natātōrium < Latin natātor, -ōris swimmer < natāre to float, swim]