The Collaborative International Dictionary of English v.0.48:

Gleam \Gleam\, v. t. [imp. & p. p. Gleamed; p. pr. & vb. n.
   Gleaming.]
   1. To shoot, or dart, as rays of light; as, at the dawn,
      light gleams in the east.
      [1913 Webster]

   2. To shine; to cast light; to glitter.

   Syn: To Gleam, Glimmer, Glitter.

   Usage: To gleam denotes a faint but distinct emission of
          light. To glimmer describes an indistinct and unsteady
          giving of light. To glitter imports a brightness that
          is intense, but varying. The morning light gleams upon
          the earth; a distant taper glimmers through the mist;
          a dewdrop glitters in the sun. See Flash.
          [1913 Webster]

WordNet (r) 3.0 (2006):

gleaming
    adj 1: bright with a steady but subdued shining; "from the plane
           we saw the city below agleam with lights"; "the gleaming
           brass on the altar"; "Nereids beneath the nitid moon"
           [syn: agleam, gleaming, nitid]
    n 1: a flash of light (especially reflected light) [syn:
         gleam, gleaming, glimmer]
    2: an appearance of reflected light [syn: gleam, gleaming,
       glow, lambency]