The Collaborative International Dictionary of English v.0.48:

Calefacient \Cal`e*fa"cient\, a. [L. calefaciens p. pr. of
   calefacere to make warm; calere to be warm + facere to make.]
   Making warm; heating. [R.]
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Calefacient \Cal`e*fa"cient\, n.
   A substance that excites warmth in the parts to which it is
   applied, as mustard.
   [1913 Webster]

WordNet (r) 3.0 (2006):

calefacient
    adj 1: producing the sensation of heat when applied to the body;
           "a mustard plaster is calefacient" [syn: calefacient,
           warming]