Op-prĕss'or, n.

noun

n. [Lat., It. oppressore, Sp. opresor, Fr. oppresseur. See OPPRESS.] One who oppresses; one who imposes unjust burdens on others; one who harasses others with unjust laws or unreasonable severity.

Power, when employed to relieve the oppressed and to punish the oppressor, becomes a great blessing. Swift.