Source : Webster's Revised Unabridged Dictionary (1913)

Spiky \Spik"y\, a.
   1. Like a spike; spikelike.

            These spiky, vivid outbursts of metallic vapors.
                                                  --C. A. Young.

   2. Having a sharp point, or sharp points; furnished or armed
      with spikes.

            Or by the spiky harrow cleared away.  --Dyer.

            The spiky wheels through heaps of carnage tore.
                                                  --Pope.

Source : WordNet®

spiky
     adj : having or as if having especially high-pitched spots;
           "absence of peaky highs and beefed-up bass" [syn: {peaky}]
     [also: {spikiest}, {spikier}]