The Collaborative International Dictionary of English v.0.48:

Granger \Gran"ger\, n.
   1. A farm steward. [Obs.]
      [1913 Webster]

   2. A member of a grange. [U. S.]
      [1913 Webster]

WordNet (r) 3.0 (2006):

granger
    n 1: a person who operates a farm [syn: farmer, husbandman,
         granger, sodbuster]