A room in a monastery that was kept warm and used as a sitting room(noun)
A warming pan, or similar device used by a priest to warm his hands(noun)
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Use "calefactory" in a sentence
"Leading out of it is the ancient "calefactory," where the fire for the censers and thuribles was preserved."
""calefactory," heated by flues, or in which a fire was kept up, where the monks might retire occasionally to warm themselves, was provided in English monasteries."
"The festival went down Saturday within the calefactory confines of Coney Island."