indicating a property of iron or the presence of iron: ferromagnetism, ferromanganese
2.
indicating the presence of iron in the divalent state: ferrocyanide Compare ferri-
Word Origin
from Latin ferrum iron
Word Origin and History for ferro-
before vowels ferr-, word-forming element indicating the presence of iron, from Latin ferro-, comb. form of ferrum "iron," possibly of Semitic origin, via Etruscan [Klein].