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warlock
war·lock [wawr-lok] Show IPA
noun
1.
a man who practices the black arts; a male witch; sorcerer.
2.
a fortuneteller or conjurer.
Origin:
before 900; Middle English warloghe, -lach, Old English wǣrloga oathbreaker, devil, equivalent to wǣr covenant + -loga betrayer (derivative of lēogan to lie)