backsight

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English[edit]

Etymology[edit]

back +‎ sight

Noun[edit]

backsight (plural backsights)

  1. The rear sight of a firearm.
  2. (surveying) A measurement or reading taken back towards a point of known elevation, used to calculate the height of the surveying instrument (theodolite, transit, total station).
  3. (surveying) A measurement of a previously shot point, used to set the angle to zero when occupying a new position.

Verb[edit]

backsight (third-person singular simple present backsights, present participle backsighting, simple past and past participle backsighted)

  1. (surveying) To shoot a backsight.

See also[edit]