Source : Webster's Revised Unabridged Dictionary (1913)

Metazoan \Met`a*zo"an\, n.; pl. {Metazoans}. (Zo["o]l.)
   One of the Metazoa.

Source : WordNet®

metazoan
     n : any animal of the subkingdom Metazoa; all animals except
         protozoans and sponges
     [also: {metazoa} (pl)]