Prusic or Prussic: How To spell?
The word Prusic is misspelled against Prussic, an adjective meaning "designating the acid now called hydrocyanic acid, but formerly called prussic acid, because Prussian blue is derived from it or its compounds. See Hydrocyanic."
Prussic has double "ss" is mispronounced as "s"Remember double 'SS' in between the strings pru & ic which should not be misspelled with single 'S'
Wrong Spelling:  pru-s-ic  Correct Spelling:  pru-ss-ic 
Check more misspelled words of Prussic to spell it correct.