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lightning arrester


from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A protective device for electrical equipment that reduces excessive voltage resulting from lightning to a safe level by grounding the discharge.

from the GNU version of the Collaborative International Dictionary of English

  • n. a device, at the place where a wire enters a building, for preventing injury by lightning to an operator or instrument. It consists of a short circuit to the ground interrupted by a thin nonconductor over which lightning jumps. Called also lightning discharger.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. electrical device inserted in a power line to protect equipment from sudden fluctuations in current


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