Definition of acierage in English:

acierage

noun

rare
  • The action or process of coating metal, especially an engraved copper plate, with a thin layer of steel by means of an electric current.

Origin

Mid 19th century. From French aciérage transformation of iron into steel from acier steel + -age.

Pronunciation:

acierage

/ˈasɪərɪdʒ/