The Collaborative International Dictionary of English v.0.48:

Patrial \Pa"tri*al\ (p[=a]"tr[i^]*al), a. [L. patria fatherland,
   country, fr. pater father.] (Lat. Gram.)
   Derived from the name of a country, and designating an
   inhabitant of the country; gentile; -- said of a noun. -- n.
   A patrial noun. Thus Romanus, a Roman, and Troas, a woman of
   Troy, are patrial nouns, or patrials. --Andrews.
   [1913 Webster]

WordNet (r) 3.0 (2006):

patrial
    n 1: a person who has the right to be considered legally a
         British citizen (by virtue of the birth of a parent or
         grandparent)