Disyllabification or Dissyllabification: How To spell?
The word Disyllabification is misspelled against Dissyllabification, a noun meaning "A forming into two syllables."
Dissyllabification has double "ss" is mispronounced as "s"Remember double 'SS' in between the strings di & yllabification which should not be misspelled with single 'S'
Wrong Spelling:  di-s-yllabification  Correct Spelling:  di-ss-yllabification 
Find more incorrect spellings of Dissyllabification to spell right way.