Children's, Intermediate and Advanced Online English Dictionary & Thesaurus

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ball lightning a rare form of lightning manifested in the form of a glowing reddish ball, approximately six inches to a foot in diameter, that moves rapidly along the ground or in the air until it disintegrates.
heat lightning lightning without thunder, seen esp. on hot evenings and believed to be reflections of more distant lightning.
lightning bug a firefly.
lightning rod a grounded metal rod placed high on a building to divert lightning by providing a path for it into the ground.
sheet lightning lightning reflected and diffused, often by a distant thunderstorm, that flashes like a sheet of light in the sky.