GNU Collaborative International Dictionary of English

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Found one definition

1.       
   Black art . The art practiced by conjurers and witches; necromancy; conjuration; magic.
   1913 Webster
   ☞ This name was given in the Middle Ages to necromancy, under the idea that the latter term was derived from niger black, instead of νεκρός, a dead person, and μαντεία, divination. 
   Wright.
   
   1913 Webster