The Collaborative International Dictionary of English v.0.48:

Scar \Scar\, n. [Scot. scar, scaur, Icel. sker a skerry, an
   isolated rock in the sea; akin to Dan. skiaer, Sw. sk[aum]r.
   Cf. Skerry.]
   An isolated or protruding rock; a steep, rocky eminence; a
   bare place on the side of a mountain or steep bank of earth.
   [Written also scaur.]
   [1913 Webster]

         O sweet and far, from cliff and scar,
         The horns of Elfland faintly blowing.    --Tennyson.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Scaur \Scaur\, n.
   A precipitous bank or rock; a scar.
   [1913 Webster]