Calefactory
Calefactory , adjective
[Latin calefactorius.]
Making hot; producing or communicating heat.
Calefactory , noun
1.
(Ecclesiastical) An apartment in a monastery, warmed and used as a sitting room.
2.
A hollow sphere of metal, filled with hot water, or a chafing dish, placed on the altar in cold weather for the priest to warm his hands with.