noun, plural zo·a [zohuh] /ˈzoʊ ə/. Biology Rare.

  1. any of the individuals of a compound organism.
  2. any individual, or the individuals collectively, produced from a single egg.
  3. zooid.

  1. a combining form meaning “animal,” “organism” of the kind specified by the initial element, often corresponding to zoological class names ending in -zoa, with -zoon used to name a single member of such a class: protozoon.

noun plural zoa (ˈzəʊə) or zoons

  1. a less common term for zooid (def. 1)

n combining form

  1. indicating an individual animal or an independently moving entity derived from an animalspermatozoon

1864, from Greek zoion “animal” (see zoo).


  1. Animal; independently moving organic unit:spermatozoon.

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