zinc-bathhttp://www.oed.com/dictionary/zinc-bath_n%3Ftab%3Dmeaning_and_usezinc bath, n.
First published 1921; not fully revised

zinc bathnoun

  1. 1843–
    1. 1843
      During the year 1827, the venereal patients took on the whole 14 saline baths, 38 zinc baths.
      R. J. Graves, System of Clinical Medicine xxvii. 339

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

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