Ferous or Ferrous: How To spell?
The word Ferous is misspelled against Ferrous, an adjective meaning "Pertaining to, or derived from, iron; -- especially used of compounds of iron in which the iron has its lower valence; as, ferrous sulphate."
Ferrous has double "rr" is mispronounced as "r"Remember double 'RR' in between the strings fe & ous which should not be misspelled with single 'R'
Wrong Spelling:  fe-r-ous  Correct Spelling:  fe-rr-ous 
Check more misspelled words of Ferrous to spell it correct.