zinc-etchinghttp://www.oed.com/dictionary/zinc-etching_n%3Ftab%3Dmeaning_and_usezinc-etching, n.
First published 1921; not fully revised

zinc-etchingnoun

  1. 1890–
    1. 1890
      In the zinc-etching systems the gelatin is spread on the zinc.
      W. J. Gordon, Foundry 216

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

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