Rhauc or Rheic: How To spell?

The word Rhauc is misspelled against Rheic, an adjective meaning "Pertaining to, or designating, an acid (commonly called chrysophanic acid) found in rhubarb (Rheum)."

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