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Webster 1913 Edition

Noun.

One who enslaves.

Swift.

Noun.

He who reduces another to bondage.

enslaver ‎(plural enslavers)

One that enslaves
- 2009 March 30, Edward Rothstein, “Casting a Sliver of Light on the Heart of Darkness”, in New York Times:
  And then came others, possessing weaponry and a sophisticated support before which tribes in dense jungles had no recourse: European concessionaires and feckless traders, brutish exploiters and enslavers.