Commisure or Commissure: How To spell?
The word Commisure is misspelled against Commissure, a noun meaning "A collection of fibers connecting parts of the brain or spinal marrow; a chiasma."
Commissure has double "ss" is mispronounced as "s"Remember double 'SS' in between the strings commi & ure which should not be misspelled with single 'S'
Wrong Spelling:  commi-s-ure  Correct Spelling:  commi-ss-ure 
Check more misspelled words of Commissure to spell it correct.