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2 definitions found

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

 cross-staff
 直角器,一種測量距離的儀器

From: Webster's Revised Unabridged Dictionary (1913)

 Cross-staff n.
 1. An instrument formerly used at sea for taking the altitudes of celestial bodies.
 2. A surveyor's instrument for measuring offsets.
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