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cross-staff

[ kraws-staf, -stahf, kros- ]
/ ˈkrɔsˌstæf, -ˌstɑf, ˈkrɒs- /
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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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Also called forestaff, Jacob's staff.

Origin of cross-staff

1400–50, for an earlier sense; late Middle English
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

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