Polysylabicity or Polysyllabicity: How To spell?
The word Polysylabicity is misspelled against Polysyllabicity, a noun meaning "Polysyllabism."
Polysyllabicity has double "ll" is mispronounced as "l"Remember double 'LL' in between the strings polysy & abicity which should not be misspelled with single 'L'
Wrong Spelling:  polysy-l-abicity  Correct Spelling:  polysy-ll-abicity 
Find more incorrect spellings of Polysyllabicity to spell right way.