zoogonidiumhttp://www.oed.com/dictionary/zoogonidium_n%3Ftab%3Dmeaning_and_usezoogonidium, n.
Revised 2017

zoogonidiumnoun

Now rare.
  1. 1857–
    (In algae) a motile gonidium.
    1. 1857
      Zoogonidia, which become united after a motile stage, and grow into immotile cells.
      Transactions Microsc. Society vol. 5 94
    2. 1872
      Non-sexual propagation taking place by means of motile gonidia (..by some called zoogonidia).
      H. C. Wood, Contribution to History of Freshwater Algæ 99
    3. 1936
      Zoogonidia very numerous, biciliate.
      A. H. S. Lucas, Seaweeds S. Australia 32

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

zoo-, comb. form was revised in June 2017.