ultraluminous

adjective
ul·​tra·​lu·​mi·​nous | \ ˌəl-trə-ˈlü-mə-nəs How to pronounce ultraluminous (audio) \

Definition of ultraluminous

: emitting an extremely large amount of electromagnetic radiation (such as light, X-rays, or infrared radiation) : extremely luminous an ultraluminous infrared galaxy We review the likely population, observational properties, and broad implications of stellar-mass black holes and ultraluminous x-ray sources.— Rob Fender et al.

First Known Use of ultraluminous

1878, in the meaning defined above

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The first known use of ultraluminous was in 1878

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