Source : Webster's Revised Unabridged Dictionary (1913)

Lessor \Les"sor\ (l[e^]s"s[o^]r or l[e^]s*s[^o]r"), n. [See
   {Lessee}, {Lease}, v. t.] (Law)
   One who leases; the person who lets to farm, or gives a
   lease. --Blackstone.

Source : WordNet®

lessor
     n : someone who grants a lease [syn: {lease giver}]