From Longman Dictionary of Contemporary Englishlightning conductorˈlightning conˌductor noun [countable] British English TBBa metal wire or bar that is attached to the side of a building and goes from the top to the ground, used to protect the building from lightning
Examples from the Corpus
lightning conductor• Franklin had also been invited to advise Glasgow University in the matter of a lightning conductor.• Glasgow's first lightning conductor drank the power of creation and waited for more. 