Wordnet 3.0
NOUN (1)
1. 
 an inhabitant of a border area (especially the border between Scotland and England); 
The Collaborative International Dictionary of English v.0.48:
Borderer \Bor"der*er\, n.
   One who dwells on a border, or at the extreme part or
   confines of a country, region, or tract of land; one who
   dwells near to a place or region.
   [1913 Webster]
         Borderers of the Caspian.                --Dyer.
   [1913 Webster]
WordNet (r) 3.0 (2006):
borderer
    n 1: an inhabitant of a border area (especially the border
         between Scotland and England)