Definition of radioluminescence in US English:

radioluminescence

noun

  • Luminescence caused by the action of ionizing radiation (whether through natural radioactive decay or deliberate irradiation).

Origin

Early 20th century. From radio- + luminescence. Compare French radioluminescence, German Radiolumineszenz.

Pronunciation

radioluminescence

/ˌreɪdɪəʊˌl(j)uːmɪˈnɛsns/