from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A black powder, FeO, used in the manufacture of steel, green heat-absorbing glass, and enamels.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. The chemical compound FeO, iron oxide where iron has a valence of +2. IUPAC has deprecated this term in favor of iron(II) oxide.
ferrous + oxide (Wiktionary)