ultraluminous
adjective
ul·tra·lu·mi·nous ˌəl-trə-ˈlü-mə-nəs 
: 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.
Rob Fender et al.
Word History
First Known Use
1878, in the meaning defined above
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