lightning arrester

noun
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.
Also called arrester.


Origin:
1855–60

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
lightning arrester
 
n
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

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
Transient voltage surge protection and lightning arrester devices shall be
  located on main service distribution equipment.
Additionally, the lightning arrester protection incoming to the mine should be
  tied to the utility ground or substation ground.
Lineman electrocuted after contacting a lightning arrester conductor while
  working from an aerial bucket.
Similar examples were given of lightning arrester and transformer replacement.
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