shimmer

shimmer (http://definr.com/shimmer)

     n : a weak and tremulous light; "the shimmer of colors on
         iridescent feathers"; "the play of light on the water"
         [syn: play]
     v 1: shine with a weak or fitful light; "Beech leaves shimmered
          in the moonlight."
     2: give off a shimmering reflection, as of silk