The Collaborative International Dictionary of English v.0.48:

Thermoluminescence \Ther`mo*lu`mi*nes"cence\, n. (Physics)
   Luminescence exhibited by a substance on being moderately
   heated. It is shown esp. by certain substances that have been
   exposed to the action of light or to X-rays. --
   Ther`mo*lu`mi*nes"cent, a.
   [Webster 1913 Suppl.]