Pronunciation: (zō'on), [key]
—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.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.