Noun | 1. | Parazoa - multicellular organisms having less-specialized cells than in the Metazoa; comprises the single phylum Porifera animal kingdom, Animalia, kingdom Animalia - taxonomic kingdom comprising all living or extinct animals phylum Porifera, Porifera - coextensive with the subkingdom Parazoa: sponges subkingdom - (biology) a taxonomic group comprising a major division of a kingdom |