Source : Webster's Revised Unabridged Dictionary (1913)

Appellor \Ap`pel*lor"\ ([a^]p`p[e^]l*l[^o]r"), n. [OF. apeleur,
   fr. L. appellator, fr. appellare.] (Law)
   (a) The person who institutes an appeal, or prosecutes
       another for a crime. --Blackstone.
   (b) One who confesses a felony committed and accuses his
       accomplices. --Blount. --Burrill.

   Note: This word is rarely or never used for the plaintiff in
         appeal from a lower court, who is called the
         {appellant}. Appellee is opposed both to {appellant}
         and appellor.