Trisylabical or Trisyllabical: How To spell?
The word Trisylabical is misspelled against Trisyllabical, an adjective meaning "pertaining to a trisyllable; consisting three syllables; as, "syllable" is a trisyllabic wd."
Trisyllabical has double "ll" is mispronounced as "l"Remember double 'LL' in between the strings trisy & abical which should not be misspelled with single 'L'
Wrong Spelling:  trisy-l-abical  Correct Spelling:  trisy-ll-abical 
Find more wrongly spelled words of Trisyllabical to spell it well.