Diacustic or Diacaustic: How To spell?

The word Diacustic 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 'U' as letter 'A' is phonetically ignor
Wrong Spelling: diac-u-stic
Correct Spelling: diac-au-stic
Check more misspelled words of Diacaustic to spell it correct.