The Collaborative International Dictionary of English v.0.48:

Illume \Il*lume"\, v. t. [imp. & p. p. Illumed; p. pr. & vb.
   n. Illuming.] [Cf. F. illuminer. See Illuminate.]
   To throw or spread light upon; to make light or bright; to
   illuminate; to illumine. --Shak.
   [1913 Webster]

         The mountain's brow,
         Illumed with fluid gold.                 --Thomson.
   [1913 Webster]

WordNet (r) 3.0 (2006):

illume
    v 1: make lighter or brighter; "This lamp lightens the room a
         bit" [syn: light, illume, illumine, light up,
         illuminate]