Longman Dictionary of Contemporary English homepage

Date: 1400-1500
Language: Latin
Origin: luminosus, from lumen 'light'

luminous

 adjective
     
Related topics: Colours
lu‧mi‧nous
1CC shining in the dark:
luminous paint
Her large dark eyes were almost luminous.
2 very brightly coloured, especially in green, pink, or yellow [= Day Glo]:
luminous green socks
—luminously adverb
—luminosity noun [uncountable] technical:
the Sun's luminosity
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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