ferric oxide

noun

, Chemistry.

1. a dark-red, crystalline, water-insoluble solid, Fe 2 O 3 , occurring naturally, as hematite and rust, or synthesized: used chiefly as a pigment, as a mordant, as a coating for magnetic recording tape, and in the manufacture of polishing compounds.

ferric oxide

noun

1. a red crystalline insoluble oxide of iron that occurs as haematite and rust and is made by heating ferrous sulphate: used as a pigment and metal polish ( jeweller's rouge ), and as a sensitive coating on magnetic tape. Formula: Fe 2 O 3 Systematic nameiron (III) oxide

ferric oxide

1. A reddish-brown to silver or black compound which occurs naturally as the mineral hematite and as rust. It is often used as a pigment and a metal polish. Chemical formula: Fe 2 O 3 .

Word History and Origins

Origin of ferric oxide¹

First recorded in 1880–85

Example Sentences

The team also found that the asteroid’s chemistry was dominated by compounds called ferric oxides and phyllosilicates, which had never been seen before on Kuiper belt objects.

From New York Times

The tape is made of paper-thin polyurethane coated with a slurry made of ferric oxide and carbon black.

From Seattle Times

The resulting dark-brown pigment may remain at the seat of the hemorrhage indefinitely, and may be accompanied with reddish-brown flakes, which, as shown by Kunkel,43 are composed of hydrated ferric oxide.

From Project Gutenberg

By converting ferrous into ferric oxide the green tint is changed to yellow, which is less noticeable.

From Project Gutenberg

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

From Project Gutenberg