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English
Noun
cross-staff (plural cross-staffs or cross-staves)
- (ecclesiastical, obsolete) A archbishop's cross.
- (historical) An early instrument, consisting of a wooden rod with a sliding crosspiece, used for measuring the altitude of a star or for surveying.
2015, David Wootton, The Invention of Science, Penguin, published 2016, page 188:The cross-staff is a very simple instrument, a calibrated shaft along which a bar slides.