The Collaborative International Dictionary of English v.0.48:

Calefactory \Cal`e*fac"to*ry\, a. [L. calefactorius.]
   Making hot; producing or communicating heat.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Calefactory \Cal`e*fac"to*ry\, n.
   1. (Eccl.) An apartment in a monastery, warmed and used as a
      sitting room.
      [1913 Webster]

   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.
      [1913 Webster]

WordNet (r) 3.0 (2006):

calefactory
    adj 1: serving to heat; "a heating pad is calefactory" [syn:
           calefactory, calefactive]