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backstaff
| backstage
| backstair
| backstairs
| backstay
| backster
backstaff
CIDE DICTIONARY
backstaff, n.
An instrument formerly used for taking the altitude of the heavenly bodies, but now superseded by the quadrant and sextant; -- so called because the observer turned his back to the body observed. [1913 Webster]
For further exploring for "backstaff" in Webster Dictionary Online
