Source : Webster's Revised Unabridged Dictionary (1913)

Calefactory \Cal`e*fac"to*ry\, a. [L. calefactorius.]
   Making hot; producing or communicating heat.

Calefactory \Cal`e*fac"to*ry\, n.
   1. (Eccl.) 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.

Source : WordNet®

calefactory
     adj : serving to heat; "a heating pad is calefactory" [syn: {calefactive},
            {heating}]