Lightning arrester Meaning, Definition & Usage

  1. noun electrical device inserted in a power line to protect equipment from sudden fluctuations in current
    spike arrester; surge protector; surge suppressor; spike suppressor.

WordNet

Definitions
  1. (Telegraphy), 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.

Webster 1913