radio-luminousadj.1
/ˌreɪdɪəʊˈl(j)uːmᵻnəs/, U.S. /ˌreɪdioʊˈlumənəs/ Emitting visible light as a result of excitation caused by ionizing radiation; radioluminescent.
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1943 Sci. Monthly May 448/2 Intensity as well as total area of illumination is considerably too high. This is usually a criticism equally applicable to direct or indirect lighting, radio-luminous, or fluorescent marked instruments.
1972 BSI News June 20/1 Insolubility of radioluminous markings on time measurement instruments.
1997 Radiation Protection Dosimetry 72 49 In recent years tritium activated radioluminous paint has become the preferred compound in dial painting by wrist watch industries.
This is a new entry (OED Third Edition, June 2008; most recently modified version published online March 2022).
radio-luminousadj.2
/ˌreɪdɪəʊˈl(j)uːmᵻnəs/, U.S. /ˌreɪdioʊˈlumənəs/ Astronomy.
Emitting radio waves, esp. in significant quantities.
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1970 Nature 12 Dec. 1072/2 Fowler and Hoyle suggested..that the symmetric ejection of radio-luminous material from galaxies could be caused by asymmetrical processes occurring in the collapse of very massive objects.
1992 S. P. Maran Astron. & Astrophysics Encycl. 15/1 Radio galaxies generally consist of two fairly symmetric radio-luminous ‘lobes’.
2002 Monthly Notices Royal Astron. Soc. 337 840 One interacting galaxy is a very radio-luminous giant elliptical.
This is a new entry (OED Third Edition, June 2008; most recently modified version published online March 2022).
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