ther|mo|lu|mi|nes|cence «THUR moh LOO muh NEHS uhns», noun.
1. the emission of light produced by heat or exposure to high temperature.
2. a method of determining the age of an archaeological specimen by heating it at a controlled rate and measuring the light it emits, the amount of such light being proportional to the age of the specimen: »

Pottery and other heat-treated artifacts up to 500,000 years old can be accurately dated by means of thermoluminescence (Scientific American).

Useful english dictionary. 2012.