Diacastic or Diacaustic: How To spell?

The word Diacastic 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 'A' as letter 'U' is phonetically ignor
Wrong Spelling: diac-a-stic
Correct Spelling: diac-au-stic
Find more wrongly spelled words of Diacaustic to spell it well.