backsight

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Noun

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

backsight (backsights, present participle backsighting; past and past participle backsighted)

1. (surveying) To shoot a backsight.

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