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English word luminous comes from Latin lumen, Romanian -os (Forms adjectives; -ous.)
lumen (Latin)
(poetic) brightness. (poetic) daylight. (poetic) the eyes. (poetic) the light of life. An opening through which light can penetrate such as an air-hole or a window.. The opening or orifice in a water-pipe or funnel. Light.
-os (Romanian)
Forms adjectives; -ous.
lumină (Romanian)
Light.
luminosus (Latin)
Bright, luminous, full of light.
lumineus (Middle French)
luminous (English)
Brightly illuminated. Emitting light; glowing brightly.