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Definition of Cross-staff
1. Noun. (nautical) An early navigational instrument, consisting of a wooden rod with a sliding crosspiece, used for measuring the altitude of a star; it developed into the sextant ¹
¹ Source: wiktionary.com
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1. Noun. (nautical) An early navigational instrument, consisting of a wooden rod with a sliding crosspiece, used for measuring the altitude of a star; it developed into the sextant ¹
¹ Source: wiktionary.com