noun, plural frig·i·dar·i·a [frij-i-dair-ee-uh] /ˌfrɪdʒ ɪˈdɛər i ə/.
Examples from the Web for frigidarium
Off the lobby to the frigidarium are recesses for boots and for linen.
From this frigidarium the bather can return to his dressing-box by way of a lobby.
Between the frigidarium and bath rooms is a double-doored lobby of a kind that is very useful in both public and private baths.
The topmost vessel, the Frigidarium, contained cold water from which the hot water tanks and the various baths were supplied.History of Sanitation|John Joseph Cosgrove
If the bather, on leaving the plunge bath, finds himself in the frigidarium, he must ascend the steps under hanging towels.