zinc-wirehttp://www.oed.com/dictionary/zinc-wire_n%3Ftab%3Dmeaning_and_usezinc wire, n.
First published 1921; not fully revised

zinc wirenoun

  1. 1803–
    1. 1803
      He placed the zinc wire on the tongue.
      Medical & Physical Journal vol. 10 58

Originally published as part of the entry for zinc, n.

zinc, n. was first published in 1921; not fully revised.