iron-DAT
īsern
N (neut, a-stem)the metal iron; an instrument or tool made from iron, especially an iron sword; an iron shackle or fetter
originates from: PGmc *īsarna- 'iron' (īsarna- > īsarn > īsærn > īsearn) through pgmc-to-oeParadigms(source: Kroonen 2013:271)