The Collaborative International Dictionary of English v.0.48:
Metazoan \Met`a*zo"an\, n.; pl. Metazoans. (Zool.) One of the Metazoa. [1913 Webster]WordNet (r) 3.0 (2006):
metazoan n 1: any animal of the subkingdom Metazoa; all animals except protozoans and sponges