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backsight

 - 1 dictionary result

back⋅sight

[bak-sahyt]
–noun Surveying.
1. a sight on a previously occupied instrument station.
2. (in leveling) the reading on a rod that is held on a point of known elevation, used in computing the elevation of the instrument.

Origin:
1840–50; back 2 + sight
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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