Pronunciation: (zō'on),[key] —n., —pl.zo•aPronunciation: (zō'u).[key]Biol. Rare. 1. any of the individuals of a compound organism.
2. any individual, or the individuals collectively, produced from a single egg.
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.