The Collaborative International Dictionary of English v.0.48:

Turreted \Tur"ret*ed\, a.
   1. Furnished with a turret or turrets; specifically (Zool.),
      having the whorls somewhat flattened on the upper side and
      often ornamented by spines or tubercles; -- said of
      certain spiral shells.
      [1913 Webster]

   2. Formed like a tower; as, a turreted lamp. --Bacon.
      [1913 Webster]