Source : Webster's Revised Unabridged Dictionary (1913)

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.]

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

Source : WordNet®

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