
1) Refrigerator
Found on
https://www.crosswordclues.com/clue/frigidarium

1) Rooms
Found on
https://www.crosswordclues.com/clue/frigidarium

A frigidarium is a large cold pool of Roman baths. It would be entered after the caldarium and the tepidarium, which were used to open the pores of the skin. The cold water would close the pores. There would be a small pool of cold water or sometimes a large swimming pool (though this, differently from the piscina natatoria, was usually covered). ...
Found on
http://en.wikipedia.org/wiki/Frigidarium

Cold room in a bath-suite, normally a cold plunge pool
Found on
http://homeworkhelp.stjohnssevenoaks.com/glossary.htm

• (n.) The cooling room of the Roman thermae, furnished with a cold bath.
Found on
http://thinkexist.com/dictionary/meaning/frigidarium/

This was coldest room in the regular sequence of bathing rooms. From the hot rooms one would go into a colder room called the frigidarium. The main function of this room was to close the pores after sweating in the hot rooms, like the tepidarium or the caldarium. In the frigidarium one could expect to find a small plunge pool of cold water (puteus …...
Found on
http://www.encyclo.co.uk/visitor-contributions.php
Frig'i·da`ri·um noun ;
plural Frigidaria . [ Latin , neut. of
frigidarium cooling.] The cooling room of the Roman thermæ, furnished with a cold bath.
Found on
http://www.encyclo.co.uk/webster/F/77

(Latin) in a Roman bath, this was the cold room; a bath's patron would enter this room following their use of the calidarium; the cold pool of water into which the patron leapt was used to close open pores or to wash off sweat after visiting the palaestra, where male patrons lifted weights and wrestled or just hung out and played board games.
Found on
https://www.encyclo.co.uk/local/10135

cold room in a bath-suite
Found on
https://www.encyclo.co.uk/local/20434

cold bath room
Found on
https://www.encyclo.co.uk/local/21777

(in an ancient Roman bath) a room having a bath of unheated water.
Found on
https://www.infoplease.com/dictionary/frigidarium
No exact match found.