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[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.
Also called forestaff, Jacob's staff.
Origin of cross-staff
late Middle English
1400-50, for an earlier sense; late Middle English Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for cross-staff
  • We cross-staff our fire engines and aid cars with the same personnel.
  • All fulltime personnel cross-staff the department's ladder truck and two engines.

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