Fosilize or Fossilize: How To spell?
The word Fosilize is misspelled against Fossilize, a verb meaning "To become antiquated, rigid, or fixed, beyond the influence of change or progress."
Fossilize has double "ss" is mispronounced as "s"Remember double 'SS' in between the strings fo & ilize which should not be misspelled with single 'S'
Wrong Spelling:  fo-s-ilize  Correct Spelling:  fo-ss-ilize 
Find more incorrect spellings of Fossilize to spell right way.