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cross-staff

[kraws-staf, -stahf, kros-] /ˈkrɔsˌstæf, -ˌstɑf, ˈkrɒs-/
noun, plural cross-staffs, cross-staves. Astronomy
1.
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.
Also called forestaff, Jacob's staff.
Origin
late Middle English
1400-1450
1400-50, for an earlier sense; late Middle English
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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