Buttresed or Buttressed: How To spell?
The word Buttresed is misspelled against Buttressed, which is past tense of "Buttress"
Buttressed has double "ss" is mispronounced as "s"Remember double 'SS' in between the strings buttre & ed which should not be misspelled with single 'S'
Wrong Spelling:  buttre-s-ed  Correct Spelling:  buttre-ss-ed 
Check more misspelled words of Buttressed to spell it correct.