rod

Definitions

General English

General Science

  • noun a light-sensitive cell in the retina of the eye, especially sensitive to poor light.

Agriculture

  • noun an old measurement of land. When used as a measurement of length a rod equals 5 metres, and when used as a measurement of area it equals 25 square metres.

Aviation

  • noun a thin straight piece of metal

Construction

  • Sharp-edged cutting screed used to trim shotcrete to forms or ground wires. See also screed.

Electronics

  • 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.

Medical

  • noun a stick shape with rounded ends
  • noun one of two types of light-sensitive cell in the retina of the eye. Rods are sensitive to dim light, but not to colour.

Politics

  • noun a stick that indicates someone’s official office or authority.

Real Estate

  • noun a narrow, usually cylindrical length of wood, metal, plastic or other material
  • noun a graduated pole used by surveyors for sighting with a levelling instrument to determine elevation differences
  • noun a board on which the dimensions of a joinery assembly such as a window or door frame are marked in full scale

Slang

  • noun a gun, particularly a pistol or revolver
  • noun the penis
  • noun a short form of hot rod

Origin & History of “rod”

It seems likely that rod is related to English rood (OE). In post-Anglo-Saxon times this has mainly been used for ‘cross of Christ’, and it now survives mainly in rood screen ‘altar screen’, but in the Old English period it was also used for ‘rod’. where their Germanic ancestor, which also produced German rute ‘rod’ and Norwegian dialect rodda ‘stake’, came from is not clear. The use of rod for a unit of measurement dates from the mid 15th century.
http://www.dictionarycentral.com/definition/rod.html