Source : Webster's Revised Unabridged Dictionary (1913)

Luminous \Lu"mi*nous\, a. [L. luminosus, fr. lumen light: cf. F.
   lumineux. See {Luminary}, {Illuminate}.]
   1. Shining; emitting or reflecting light; brilliant; bright;
      as, the is a luminous body; a luminous color.

            Fire burneth wood, making it . . . luminous.
                                                  --Bacon.

            The mountains lift . . . their lofty and luminous
            heads.                                --Longfellow.

   2. Illuminated; full of light; bright; as, many candles made
      the room luminous.

            Up the staircase moved a luminous space in the
            darkness.                             --Longfellow.

   3. Enlightened; intelligent; also, clear; intelligible; as, a
      luminous mind. `` Luminous eloquence.'' --Macaulay. `` A
      luminous statement.'' --Brougham.

   {Luminous paint}, a paint made up with some phosphorescent
      substance, as sulphide of calcium, which after exposure to
      a strong light is luminous in the dark for a time.

   Syn: Lucid; clear; shining; perspicuous. -- {Lu"mi*nous*ly},
        adv. -- {Lu"mi*nous*ness}, n.

Source : WordNet®

luminous
     adj : softly bright or radiant; "a house aglow with lights";
           "glowing embers"; "lambent tongues of flame"; "the
           lucent moon"; "a sky luminous with stars" [syn: {aglow(p)},
            {glowing}, {lambent}, {lucent}]