The Collaborative International Dictionary of English v.0.48:

Ferm \Ferm\, Ferme \Ferme\, n.[See Farm.]
   Rent for a farm; a farm; also, an abode; a place of
   residence; as, he let his land to ferm. [Obs.]
   [1913 Webster]

         Out of her fleshy ferme fled to the place of pain.
                                                  --Spenser.
   [1913 Webster]

Bouvier's Law Dictionary, Revised 6th Ed (1856):

FERM or FEARM. By this ancient word is meant land, fundus; (q.v.) and, it
is said, houses and tenements may pass by it. Co. Litt. 5 a.