| 单词 | cross-staff |
| 释义 | cross-staff /kraws"staf', -stahf', kros"-/, n. , pl. cross-staffs, cross-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. [1400-50, for an earlier sense; late ME] |
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