Meaning of frigidarium

frig•i•dar•i•um

Pronunciation: (frij"i-dâr'ē-um), [key]
— pl. -dar•i•a
  1. (in an ancient Roman bath) a room having a bath of unheated water.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.