ferrous oxide

noun

, Chemistry.

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

ferrous oxide

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

Word History and Origins

Origin of ferrous oxide¹

First recorded in 1870–75

Example Sentences

Calculate the percentage as ferrous oxide, unless there are reasons to the contrary, also calculate its weight as ferric oxide.

From Project Gutenberg

The iron found is multiplied by 1.286, and reported as ferrous oxide.

From Project Gutenberg

Thus iron protoxide is now generally known as ferrous oxide, and iron peroxide as ferric oxide.

From Project Gutenberg

A little more, and I won't know whether I'm a nitrous sulphide or a ferrous oxide of bromo seltzer.

From Project Gutenberg

In a reducing atmosphere, on the contrary, ferrous oxide readily forms and attacks the clay, forming a dark grey vitreous mass.

From Project Gutenberg