lu ‧ mi ‧ nous /ˈluːmənəs, ˈluːmɪnəs/ BrE AmE adjective
[ Date: 1400-1500 ; Language: Latin ; Origin: luminosus , from lumen 'light' ]
1 . shining in the dark:
luminous paint
Her large dark eyes were almost luminous.
2 . very brightly coloured, especially in green, pink, or yellow SYN Day Glo :
luminous green socks
—luminously adverb
—luminosity /ˌluːməˈnɒsəti, ˌluːmɪˈnɒsəti $ -ˈnɑː-/ noun [uncountable] technical :
the Sun’s luminosity