Source : Webster's Revised Unabridged Dictionary (1913)

Pillared \Pil"lared\, a.
   Supported or ornamented by pillars; resembling a pillar, or
   pillars. ``The pillared arches.'' --Sir W. Scott. ``Pillared
   flame.'' --Thomson.

Source : WordNet®

pillared
     adj : having pillars; "the pillared portico"