Artificial intelligent assistant

nuller

† ˈnuller Obs. rare—1.
  [f. null v.1 + -er1.]
  One who annuls; a nullifier.

1650–87 H. More Conject. Cabbal. (1713) 240 Gross Idolaters, bold Nullers or Abrogators of the indispensable Laws of Christ.

Oxford English Dictionary

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