zone-refinerhttp://www.oed.com/dictionary/zone-refiner_n%3Ftab%3Dmeaning_and_usezone refiner, n.
First published 1986; not fully revised

zone refinernoun

  1. 1959–
    An apparatus used for zone refining.
    1. 1959
      It will be possible to obtain high quality single-crystal rods after a few passes in the zone-refiner.
      Times 24 November 19/7
    2. 1980
      A novel zone refiner is described, in which a single helical heater rotates in an annular sample space.
      Analytical Chemistry vol. 52 1738/1

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

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