The Collaborative International Dictionary of English v.0.48:

Dapple \Dap"ple\, Dappled \Dap"pled\, a.
   Marked with spots of different shades of color; spotted;
   variegated; as, a dapple horse.
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         Some dapple mists still floated along the peaks. --Sir
                                                  W. Scott.
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   Note: The word is used in composition to denote that some
         color is variegated or marked with spots; as,
         dapple-bay; dapple-gray.
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               His steed was all dapple-gray.     --Chaucer.
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               O, swiftly can speed my dapple-gray steed. --Sir
                                                  W. Scott.
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The Collaborative International Dictionary of English v.0.48:

Dapple \Dap"ple\, v. t. [imp. & p. p. Dappled; p. pr. & vb. n.
   Dappling.]
   To variegate with spots; to spot.
   [1913 Webster]

         The gentle day, . . .
         Dapples the drowsy east with spots of gray. --Shak.
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         The dappled pink and blushing rose.      --Prior.
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WordNet (r) 3.0 (2006):

dappled
    adj 1: having spots or patches of color [syn: dappled,
           mottled]