Thunderbolt, Lightning, Bolt Of Lightning, Lightning Strike
noun, verbal noun
Thunder that falls from the sky is a thunderbolt.
らくらい
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
落雷が直撃したのに、奇跡的に無傷だった。
Even though the thunderbolt was a direct hit, I was miraculously unhurt.