Ferriin

Ferriin is a term that does not have a single, universally recognized meaning in science. In reputable sources it is often seen as a misspelling of ferritin, the iron-storage protein, or as a placeholder for a hypothetical iron-containing material in fiction or speculative discussions. Because there is no standard definition, its meaning depends on context.

In biology, ferritin is a protein complex that stores iron in a mineral core and releases it as needed by the cell. If ferriin appears in biological literature, it usually indicates a typographical error rather than a distinct molecule.

In chemistry and materials science, ferriin may be used informally to denote a hypothetical iron complex or compound. This use is nonstandard and not part of formal nomenclature; real iron chemistry describes ferric (Fe3+) and ferrous (Fe2+) species, and ligated iron complexes with established names.

In fiction and speculative writing, ferriin may describe an imagined iron-rich material with unusual properties. Such usage is unconstrained by real-world chemistry and should be interpreted as fictional.

See also: ferritin, ferric ion, ferrous ion, ferroin.