Source : Webster's Revised Unabridged Dictionary (1913)

Counterscarf \Coun"ter*scarf`\ (-sk?rf`), n. [Counter- + scarp:
   cf. F. contrescarpe.] (Fort.)
   The exterior slope or wall of the ditch; -- sometimes, the
   whole covered way, beyond the ditch, with its parapet and
   glacis; as, the enemy have lodged themselves on the
   counterscarp.