siderophile noun 3adjective 2forms 3 noun3 •In the Goldschmidt classification, an element that forms alloys easily with iron and is concentrated in the Earth's core. •An element that has a strong chemical affinity for metallic iron. •A cell or tissue that has an affinity for iron. adjective2 •Having an affinity for iron. •Having an strong chemical affinity for metallic iron. formssiderophiles · more siderophile · most siderophile