Diacuastic or Diacaustic: How To spell?

The word Diacuastic is misspelled against Diacaustic, a noun meaning "A curved formed by the consecutive intersections of rays of light refracted through a lens."

Word contains consecutive vowels 'AU' in between alphabets diac & stic is misspelled as 'UA'
Wrong Spelling:  diac-ua-stic 
Correct Spelling:  diac-au-stic 
Check more misspelled words of Diacaustic to spell it correct.

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