Catacaostic or Catacaustic: How To spell?

The word Catacaostic is misspelled against Catacaustic, a noun meaning "A caustic curve formed by reflection of light."

Word contains consecutive vowels 'AU' in between alphabets catac & stic is misspelled as 'AO'
Wrong Spelling:  catac-ao-stic 
Correct Spelling:  catac-au-stic 
Find more incorrect spellings of Catacaustic to spell right way.

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