zone-reticlehttp://www.oed.com/dictionary/zone-reticle_n%3Ftab%3Dmeaning_and_usezone-reticle, n.
First published 1921; not fully revised

zone-reticlenoun

  1. 1877–
    1. 1877
      Observers..will find a ‘zone reticle’ of great service.
      G. F. Chambers, Handbook of Descriptive Astronomy (ed. 3) vii. i. 632

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

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