backsight
backsight
(ˈbækˌsaɪt)n
1. (Shooting) the sight of a rifle nearer the stock
2. (Surveying) surveying a reading taken looking backwards to a previously occupied station. Compare foresight4
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014