Reredemen or Reredemain: How To spell?

The word Reredemen is misspelled against Reredemain, a noun meaning "A backward stroke."

Word contains consecutive vowels 'AI' in between alphabets reredem & n is misspelled as 'E'
Wrong Spelling:  reredem-e-n 
Correct Spelling:  reredem-ai-n 
Explore spell check of Reredemain to spell without errors.

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