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luminous (adj.)

early 15c., "full of light, shiny," from Latin luminosus "shining, full of light, conspicuous," from lumen (genitive luminis) "light," from suffixed form of PIE root *leuk- "light, brightness." Related: Luminously; luminousness.

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Definitions of luminous from WordNet

luminous (adj.)
softly bright or radiant;
a sky luminous with stars
Synonyms: aglow / lambent / lucent
From wordnet.princeton.edu