A cold room or bath in ancient Roman bathhouses, used for cold water immersion as part of bathing rituals.
From Latin 'frigidarium,' derived from 'frigidus' (cold) plus the suffix '-arium' (place or room). In Roman bath complexes, this room followed the warm caldarium and provided therapeutic cooling.
Roman engineers were basically ancient spa designers—they understood that alternating between hot and cold water improved circulation and felt amazing, a practice that modern contrast therapy still uses today!
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