Disyllabic or Dissyllabic: How To spell?
The word Disyllabic is misspelled against Dissyllabic, an adjective meaning "Consisting of two syllables only; as, a dissyllabic foot in poetry."
Dissyllabic has double "ss" is mispronounced as "s"Remember double 'SS' in between the strings di & yllabic which should not be misspelled with single 'S'
Wrong Spelling:  di-s-yllabic  Correct Spelling:  di-ss-yllabic 
Find more wrongly spelled words of Dissyllabic to spell it well.