Férrosa
Férrosa is the feminine form of the adjective férroso, used in Spanish (and in Portuguese with the same root) to describe substances or characteristics relating to iron. It denotes iron-containing materials or properties, typically in reference to the ferrous (Fe2+) state. Because it is an inflected form, its usage depends on the gender and number of the noun it modifies.
In practice, ferrosa appears in technical contexts such as chemistry, metallurgy, and geology. It is commonly
Etymologically, férrosa derives from ferrum (Latin for iron) with the suffix -oso, which yields adjectives meaning
See also: ferrous/ferroso terminology, férrico, férrico vs ferroso in chemistry, minerals ferrosos, ions ferrosos, solució ferrosa.