A narrow triangular piece of land. The word goes back to the Low Latin gora: Radulfus tenet unam goram terræ, 13th c., N.E.D. See also other notes in the same.

1

1799.  The lands called “The Gore” in New York depend on the same principles as our Luzerne lands.—The Aurora, Phila., Dec. 2.

2

1887.  I wasn’t born in any town whatever, but in what New Englanders call a ‘gore’—a triangular strip of land that gets left out somehow when the towns [townships] are surveyed.—G. W. Sears, ‘Forest Runes,’ p. vii. (N.E.D.)

3