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From The Collaborative International Dictionary of English v.0.48:
Black art \Black" art`\ The art practiced by conjurers and witches; necromancy; conjuration; magic. [1913 Webster] Note: This name was given in the Middle Ages to necromancy, under the idea that the latter term was derived from niger black, instead of nekro`s, a dead person, and mantei`a, divination. --Wright. [1913 Webster]