Artificial intelligent assistant

phylactic

phyˈlactic Obs. rare.
  [ad. Gr. ϕυλακτικός adj., having the quality of guarding, f. stem ϕυλακ- (see prec.).]
  A preservative; a prophylactic.

1706 Cary (title) A Physician's Phylactic, Against a Lawyer's Venefic: or, An Answer to a Book, abusively Entitled, The Rights of the Christian Church, Asserted.

Oxford English Dictionary

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