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Cross-staff
noun
Definitions
Noun
- 1 An archbishop's cross. obsolete
- 2 An early instrument, consisting of a wooden rod with a sliding crosspiece, used for measuring the altitude of a star or for surveying. historical
"The cross-staff is a very simple instrument, a calibrated shaft along which a bar slides."
See also for "cross-staff"
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Unscramble this word: crossstaff