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2 definitions found

From: DICT.TW English-Chinese Dictionary 英漢字典

 backsight
 後視,表尺

From: Webster's Revised Unabridged Dictionary (1913)

 Back·sight n.    Surv. The reading of the leveling staff in its unchanged position when the leveling instrument has been taken to a new position; a sight directed backwards to a station previously occupied.  Cf. Foresight, n., 3.