Altisimo or Altissimo: How To spell?
The word Altisimo is misspelled against Altissimo, a noun meaning "The part or notes situated above F in alt."
Altissimo has double "ss" is mispronounced as "s"Remember double 'SS' in between the strings alti & imo which should not be misspelled with single 'S'
Wrong Spelling:  alti-s-imo  Correct Spelling:  alti-ss-imo 
Find more incorrect spellings of Altissimo to spell right way.