Mouseline or Mousseline: How To spell?
The word Mouseline is misspelled against Mousseline, a noun meaning "Muslin."
Mousseline has double "ss" is mispronounced as "s"Remember double 'SS' in between the strings mou & eline which should not be misspelled with single 'S'
Wrong Spelling:  mou-s-eline  Correct Spelling:  mou-ss-eline 
Check more misspelled words of Mousseline to spell it correct.