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
Sorry, no etymologies found.