Aughtieth or Eightieth: How To spell?

The word Aughtieth is misspelled against Eightieth, a noun meaning "The quotient of a unit divided by eighty; one of eighty equal parts."

Word begins with consecutive vowels 'EI' followed by alphabets 'ghtieth' is misspelled as 'AU'
Wrong Spelling:  au-ghtieth 
Correct Spelling:  ei-ghtieth 
Check more misspelled words of Eightieth to spell it correct.