An Etymological Dictionary of Astronomy and Astrophysics
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Of or containing → iron, especially in the bivalent state. More specifically, iron with → oxidation number of +2, denoted iron(II) or Fe2+.

From L. ferrum "iron," + -ous a suffix forming adjectives that have the general sense "possessing, full of" a given quality.

Fervar, from fer, loan from Fr., + -var adj. suffix.

Iron in a plus-2 → oxidation state.

→ ferrous; → iron.