Hygrodauk or Hygrodeik: How To spell?

The word Hygrodauk is misspelled against Hygrodeik, a noun meaning "A form of hygrometer having wet and dry bulb thermometers, with an adjustable index showing directly the percentage of moisture in the air, etc."

Word contains consecutive vowels 'EI' in between alphabets hygrod & k is misspelled as 'AU'
Wrong Spelling:  hygrod-au-k 
Correct Spelling:  hygrod-ei-k 
Check more misspelled words of Hygrodeik to spell it correct.