The Collaborative International Dictionary of English v.0.48:

Fiar \Fi"ar\ (? or ?), n. [See Feuar.]
   1. (Scots Law) One in whom the property of an estate is
      vested, subject to the estate of a life renter.
      [1913 Webster]

            I am fiar of the lands; she a life renter. --Sir W.
                                                  Scott.
      [1913 Webster]

   2. pl. The price of grain, as legally fixed, in the counties
      of Scotland, for the current year.
      [1913 Webster]

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

FIAR, Scotch law. He whose property is burdened with a life rent. Ersk. Pr.
of L. Scot. B. 2, t. 9, s. 23.