What is 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 the cathode rays. ---lu`mi*nes"cent (#), a called?

thermoluminescence — 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 the cathode rays. ---lu`mi*nes"cent (#), a. (Webster's 1913.)

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