Efluvium or Effluvium: How To spell?
The word Efluvium is misspelled against Effluvium, meaning "A noxious or ill-smelling exhalation from decaying or putrefying matter."
Effluvium has double "ff" is mispronounced as "f"Remember double 'FF' in between the strings E & luvium which should not be misspelled with single 'F'
Wrong Spelling:  E-f-luvium  Correct Spelling:  E-ff-luvium 
Check more misspelled words of Effluvium to spell it correct.