Disyllable or Dissyllable: How To spell?
The word Disyllable is misspelled against Dissyllable, a noun meaning "A word of two syllables; as, pa-per."
Dissyllable has double "ss" is mispronounced as "s"Remember double 'SS' in between the strings di & yllable which should not be misspelled with single 'S'
Wrong Spelling:  di-s-yllable  Correct Spelling:  di-ss-yllable 
Find more wrongly spelled words of Dissyllable to spell it well.