n. [ Gr.
n. [ See Luminescent. ]
a. [ Photo- + luminescence. ] (Physics) Luminescence induced by exposure to light waves in the infrared to ultraviolet range. [ Webster 1913 Suppl. +PJC ]
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. --