Lightning-arrester
noun
1.
a device for preventing damage to radio, telephonic, or other electric equipment from lightning or other high-voltage currents, using spark gaps to carry the current to the ground without passing through the device.
noun
1.
a device that protects electrical equipment, such as an aerial, from an excessive voltage resulting from a lightning discharge or other accidental electric surge, by discharging it to earth
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noun 1. a metal strip terminating in a series of sharp points, attached to the highest part of a building, etc, to discharge the electric field before it can reach a dangerous level and cause a lightning strike
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noun 1. a discharge of lightning between a cloud and the earth, esp one that causes damage 2. (vet science) sudden death due to being struck by lightning, esp of cattle, horses or sheep