Plural of calefactory; multiple warming rooms or heated chambers in monasteries or communal buildings.
From calefactory with regular English plural -ies. From Latin calefactorium, a place (suffix -orium) where heating happens.
In freezing medieval winters, the calefactory was the heart of monastic life—monks could only enter this one warm room for limited hours, making it a precious commodity and a gathering place for community!
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