Backstaf or Backstaff: How To spell?

The word Backstaf is misspelled against Backstaff, a noun meaning "An instrument formerly used for taking the altitude of the heavenly bodies, but now superseded by the quadrant and sextant; -- so called because the observer turned his back to the body observed."

Backstaff has double 'ff' in the end mispronounced as 'f'
Remember double 'FF' appears in the end of this word which should not be misspelled with single 'F'
Wrong Spelling:  backsta-f 
Correct Spelling:  backsta-ff 
Browse incorrect spellings of Backstaff to spell it good.

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