Source : Webster's Revised Unabridged Dictionary (1913)

Pyroelectricity \Pyr`o*e`lec*tric"i*ty\, n. (Physics)
   Electricity developed by means of heat; the science which
   treats of electricity thus developed.

Source : WordNet®

pyroelectricity
     n : generation of an electric charge on certain crystals (such
         as tourmaline) as a result of a change in temperature