Calefactory /(?)/

Cal·e·fac·to·ry

Calefactory

a.
  1. Making hot; producing or communicating heat.

Calefactory

n.
  1. An apartment in a monastery, warmed and used as a sitting room. (Eccl.)
  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.