Rhec or Rheic: How To spell?

The word Rhec 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 'E' as letter 'I' is phonetically ignored
Wrong Spelling:  rh-e-c 
Correct Spelling:  rh-ei-c 
Explore spell check of Rheic to spell without errors.

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