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lightning conductor

(also chiefly North American lightning rod)
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Definition of lightning conductor

noun

British
  • a metal rod or wire fixed to an exposed part of a building or other tall structure to divert lightning harmlessly into the ground.
  • a person or thing that attracts criticism, especially in order to divert attention from more serious issues or allow a more important public figure to appear blameless.

lightning conductor in other Oxford dictionaries

Definition of lightning conductor in the US English dictionary