Thayer's Greek Lexicon

 1. light, bright, brilliant
  1) brilliant from whiteness, (dazzling) white
1a1. of the garments of angels, and of those exalted to the
splendour of the heavenly state
1a2. shining or white garments worn on festive or state occasions
1a3. of white garments as the sign of innocence and purity of the
soul
  2) dead white
1b1. of the whitening colour of ripening grain