[fer-uh s] /ˈfɛr əs/

adjective, Chemistry.
of or containing iron, especially in the bivalent state.
of or containing iron in the divalent state; designating an iron (II) compound

“pertaining to or containing iron,” 1865, from Latin ferreus “made of iron,” from ferrum “iron” (see ferro-). In chemistry, “containing iron,” especially with a valence of two.

ferrous fer·rous (fěr’əs)
Of, relating to, or containing iron, especially with a valence of 2 or a valence lower than in a corresponding ferric compound.
Containing iron, especially iron with a valence of 2. Compare ferric.


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  • Ferrous-oxide

    noun, Chemistry. 1. a black powder, FeO, insoluble in water, soluble in acid. ferrous oxide A black powder used to make steel, green heat-absorbing glass, and enamels. Chemical formula: FeO.

  • Ferrous-sulfate

    noun, Chemistry, Pharmacology. 1. a bluish-green, crystalline, saline-tasting, water-soluble heptahydrated solid, FeSO 4 ⋅7H 2 O, used chiefly in the manufacture of other iron salts, in water purification, fertilizer, inks, pigments, tanning, photography, and in medicine in the treatment of anemia. ferrous sulfate A bluish-green crystalline compound that is used in sewage and water treatment, […]

  • Ferrous-sulfide

    noun, Chemistry. 1. a dark or black metallic crystalline compound, FeS, insoluble in water, soluble in acids, used in ceramics and to generate hydrogen sulfide.

  • Ferrovanadium

    [fer-oh-vuh-ney-dee-uh m] /ˌfɛr oʊ vəˈneɪ di əm/ noun 1. a ferroalloy containing up to 55 percent .

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