A black powder, FeO, used in making steel and glass.
- All fertilizer salts react the same way, whether they're potassium chloride, ammonium nitrate (NH.sub.4] NO.sub.3] or ferrous oxide (FeO).
- The other thing I've done today is register myself as an organisation in order to get me a catalogue for buying ammonium ferrous oxide crystals.
- During that period of time, moisture was continually trying to convert them to ferrous oxide.
For editors and proofreaders
Syllabification: fer·rous ox·ide
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