zonallyhttp://www.oed.com/dictionary/zonally_adv%3Ftab%3Dmeaning_and_usezonally, adv.
First published 1921; not fully revised

zonallyadverb

  1. 1873–
    In or according to zones.
    Stressed as ˈzonally.
    1. 1873
      The segments..of the body, which are arranged zonally along a longitudinal axis.
      A. Wilson, Elements of Zoology i. ii. 22
    2. 1889
      Crystals of the hyacinth variety of quartz..contain numerous inclusions of anhydrite arranged zonally.
      American Naturalist vol. 23 814

Originally published as part of the entry for zonal, adj.

zonal, adj. was first published in 1921; not fully revised.