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cross-staff



Pronunciation: (krôs'staf", -stäf", kros'-), [key]
n.,
pl. -staffs, -staves.
Astron.
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.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

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