Osuarium or Ossuarium: How To spell?
The word Osuarium is misspelled against Ossuarium, a noun meaning "A charnel house; an ossuary."
Ossuarium has double "ss" is mispronounced as "s"Remember double 'SS' in between the strings o & uarium which should not be misspelled with single 'S'
Wrong Spelling:  o-s-uarium  Correct Spelling:  o-ss-uarium 
Check more misspelled words of Ossuarium to spell it correct.