A 'Caldarium' (also called a 'Calidarium', 'Cella Caldaria' or 'Cella Coctilium') was a room with a hot plunge bath, used in a
Roman bath complex.
This was a very hot and steamy room heated by a
hypocaust, an
underfloor heating system. This was the hottest room in the regular sequence of bathing rooms; after the caldarium, bathers would progress to the
tepidarium and the
frigidarium.
In the caldarium there would be a bath (alveus, piscina calida or solium) of hot water sunk into the floor and there was sometimes even a laconicum - a hot, dry area for inducing sweating.
The bath's patrons would use
olive oil to cleanse themselves by applying it to their bodies and using a
strigil to remove the excess.
In modern
gyms and
spas a caldarium is a room with a hot floor.
External links
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Definition of Caldarium