Mercuramonium or Mercurammonium: How To spell?
The word Mercuramonium is misspelled against Mercurammonium, a noun meaning "A radical regarded as derived from ammonium by the substitution of mercury for a portion of the hydrogen."
Mercurammonium has double "mm" is mispronounced as "m"Remember double 'MM' in between the strings mercura & onium which should not be misspelled with single 'M'
Wrong Spelling:  mercura-m-onium  Correct Spelling:  mercura-mm-onium 
Check more misspelled words of Mercurammonium to spell it correct.