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From The Collaborative International Dictionary of English v.0.48:
Oppressor \Op*press"or\, n. [L.] One who oppresses; one who imposes unjust burdens on others; one who harasses others with unjust laws or unreasonable severity. [1913 Webster] The orphan pines while the oppressor feeds. --Shak. [1913 Webster] To relieve the oppressed and to punish the oppressor. --Swift. [1913 Webster]