zinc-sulphidehttp://www.oed.com/dictionary/zinc-sulphide_n%3Ftab%3Dmeaning_and_usezinc sulphide, n.
First published 1921; not fully revised

zinc sulphidenoun

U.S.
  1. 1851–
    A yellow, water-insoluble powder, ZnS, used as a pigment and as a phosphor.
    1. 1851
      Nöggerath and Bischof..found in an old mine a quantity of zinc-sulphide mixed with washings of the ore.
      H. Watts, translation of L. Gmelin, Hand-book of Chemistry vol. V. xxviii. 19
    2. 1937
      The [television] screen is coated with a powder consisting of zinc sulphide and other chemicals.
      Discovery February 44/2
    3. 1974
      Zinc sulfide is insoluble in water but dissolves in mineral acids.
      Encyclopædia Britannica Micropædia vol. X. 883/3

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

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