Eer +‎ -ig. First element from Old High German ēr (“ore; brass”), from Proto-Germanic *aiz (“copper, bronze; ore”), from Proto-Indo-European *áyos (“a metal, copper, bronze”). Compare Italian rameico, Spanish alámbrico.

eerig

1. (Uri) Made of iron or bronze.

• Abegg, Emil, (1911) Die Mundart von Urseren (Beiträge zur Schweizerdeutschen Grammatik. IV.) [The Dialect of Urseren], Frauenfeld, Switzerland: Huber & Co., page 23.