Rhaic or Rheic: How To spell?

The word Rhaic 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 'AI'
Wrong Spelling:  rh-ai-c 
Correct Spelling:  rh-ei-c 
Find more wrongly spelled words of Rheic to spell it well.