/ ˈwɔːlɒk; NAmE ˈwɔːrlɑːk/ noun
a man who is believed to have magic powers, especially evil ones
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WORD ORIGIN
Old English wǣrloga traitor, scoundrel, monster , also the Devil , from wǣr covenant + an element related to lēogan belie, deny . From its application to the Devil, the word was transferred in Middle English to a person in league with the Devil, and hence a sorcerer. It was chiefly Scots until given wider currency by Sir Walter Scott.