An Etymological Dictionary of Astronomy and Astrophysics
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Of or containing → iron, especially in the trivalent state. More specifically, iron with an → oxidation number of +3; also denoted iron(III) or Fe³⁺.

Ferric, from L. ferrum "iron," + → -ic.

Iron in a plus-3 → oxidation state. Ferric iron needs to share three electrons with an oxygen molecule to make the ion neutral.

→ ferric; → iron.