zone-refinedhttp://www.oed.com/dictionary/zone-refined_adj%3Ftab%3Dmeaning_and_usezone-refined, adj.
First published 1986; not fully revised

zone-refinedadjective

  1. 1956–
    1. 1956
      F. Montariol and coworkers..found that zone-refined aluminum cannot be hardened by cold-working.
      W. G. Pfann in Chemical & Engineering News vol. 34 1443/3
    2. 1983
      Straining electrode experiments were performed in zone refined and vacuum melted nickel alloys.
      Metall. Trans. A. vol. XIV. 223/2

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

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