[kraws-staf, -stahf, kros-] /ˈkrɔsˌstæf, -ˌstɑf, ˈkrɒs-/

noun, plural cross-staffs, cross-staves. Astronomy.
an instrument for measuring the angle of elevation of heavenly bodies, consisting of a calibrated staff with another shorter staff perpendicular to and sliding on it.


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