• noun a light-sensitive cell in the retina of the eye, especially sensitive to poor light.
  • A straight bar or piece of a material which usually has a particular function or use. Examples include control, ferrite, ground, and lightning rods.
  • A rod (1) whose pointed shape, placement on top of a structure or area, and conductivity enable it to attract lightning discharges and provide a cone-shaped zone, called a cone of protection, below which there is a highly reduced probability of a lightning strike. A lightning rod is usually metallic, although another good conductor may be utilized. Also called lightning rod.

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