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lightning conductor

noun [C]
 
UK (US lightning rod)

Definition

a strip of metal, going from the highest point of a building to the ground, that prevents lightning from damaging the building by taking the electricity to the ground before it can reach a dangerous levelPoles, rods, shafts and sticks
(Definition of lightning conductor noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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