zymoscopehttp://www.oed.com/dictionary/zymoscope_n%3Ftab%3Dmeaning_and_usezymoscope, n.
First published 1921; not fully revised

zymoscopenoun

  1. 1868–
    See quot.
    Stressed as ˈzymoscope.
    1. 1868
      Zymoscope, an instrument..for testing the fermenting power of yeast, by bringing it in contact with sugar-water, and observing the quantity of carbonic anhydride evolved.
      H. Watts, Dictionary of Chemistry vol. V. 1086

Originally published as part of the entry for zymo-, comb. form

zymo-, comb. form was first published in 1921; not fully revised.