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单词 cross-staff
释义

WordReference Random House Unabridged Dictionary of American English © 2024
cross-staff  (krôsstaf′, -stäf′, kros-),USA pronunciation n., pl. -staffs, -staves. [Astron.]
  1. Astronomyan 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. 
  • late Middle English 1400–50, for an earlier sense

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