ferrous oxide

American  

noun

Chemistry.

1. a black powder, FeO, insoluble in water, soluble in acid.

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ferrous oxide Scientific  

1. A black powder used to make steel, green heat-absorbing glass, and enamels. Chemical formula: FeO.

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Etymology

Origin of ferrous oxide

First recorded in 1870–75

Example Sentences

Amused and enchanted, I named him "Ferrous" for the chemical name of rust, hydrated ferrous oxide.

From New York Times • Feb. 13, 2018

The ammonia precipitate contains the whole of the iron as ferric oxide; hence the necessity for calculating the ferrous oxide as ferric, and deducting it.

From A Text-book of Assaying: For the Use of Those Connected with Mines. by Beringer, Cornelius

For example, ferrous oxide is FeO and ferrous chloride is FeCl2, and, again, ferric oxide is Fe2O3, whilst ferric chloride is Fe2Cl6.

From A Text-book of Assaying: For the Use of Those Connected with Mines. by Beringer, Cornelius

Staurolite, stawr′ō-līt, n. a silicate of alumina with ferrous oxide, magnesia, and water, crystallising in trimetric forms, common as twinned cruciform crystals in certain states.—adj.

From Chambers's Twentieth Century Dictionary (part 4 of 4: S-Z and supplements) by Various

The analysis showed the presence of 6.89 per cent. of ferrous oxide, and some oxide of copper.

From A Text-book of Assaying: For the Use of Those Connected with Mines. by Beringer, Cornelius