Desis or Deesis: How To spell?
The word Desis is misspelled against Deesis, a noun meaning "An invocation of, or address to, the Supreme Being."
Deesis has double "ee" is mispronounced as "e"Remember double 'EE' in between the strings D & sis which should not be misspelled with single 'E'
Wrong Spelling:  D-e-sis  Correct Spelling:  D-ee-sis 
Find more wrongly spelled words of Deesis to spell it well.