coppern

From Middle English copren, equivalent to copper +‎ -en (“made of”). Compare Old English cyperen (“coppern”), of like formation.

coppern (comparative more coppern, superlative most coppern)

1. (archaic or poetic) Made or consisting of copper; coppery.
   • 1877, Johann Peter Lange, A Commentary on the Holy Scriptures:

     "Therefrom Solomon made the copper sea and the pillars and the coppern vessels."

   • 1967, Ssanang Ssetsen, The Bejewelled Summary of the Origin of Khans:

     [...] the ministers, in order to slay him in accordance with the King's command, cut at him with all kinds of swords, but they availed naught and were unable; they put him into a coppern casket and cast him into the Ganges River.

   • 2001, T︠S︡eren Korsunkievich Korsunkiev, John Richard Krueger, Ancient Oirat Books about Oriental Medicine:

     […] a schema before them on a coppern (reference) figure of a person with markings of acupuncture points (youli kumiini zuruq).