Syneorosis or Synneorosis: How To spell?
The word Syneorosis is misspelled against Synneorosis, a noun meaning "Syndesmosis."
Synneorosis has double "nn" is mispronounced as "n"Remember double 'NN' in between the strings sy & eorosis which should not be misspelled with single 'N'
Wrong Spelling:  sy-n-eorosis  Correct Spelling:  sy-nn-eorosis 
Find more incorrect spellings of Synneorosis to spell right way.