*appellor*

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. [ 1913 Webster ]

☞ 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. [ 1913 Webster ]