Dissymetrical or Dissymmetrical: How To spell?
The word Dissymetrical is misspelled against Dissymmetrical, an adjective meaning "Not having symmetry; asymmetrical; unsymmetrical."
Dissymmetrical has double "mm" is mispronounced as "m"Remember double 'MM' in between the strings dissy & etrical which should not be misspelled with single 'M'
Wrong Spelling:  dissy-m-etrical  Correct Spelling:  dissy-mm-etrical 
Find more wrongly spelled words of Dissymmetrical to spell it well.