Met`a`zo´a
| n. pl. | 1. | (Zool.) Those animals in which the protoplasmic mass, constituting the egg, is converted into a multitude of cells, which are metamorphosed into the tissues of the body. A central cavity is commonly developed, and the cells around it are at first arranged in two layers, - the ectoderm and endoderm. The group comprises nearly all animals except the Protozoa. |
ThesaurusLegend: Synonyms Related Words Antonyms
| Noun | 1. |  Metazoa - multicellular animals having cells differentiated into tissues and organs and usually a digestive cavity and nervous systemanimal kingdom, Animalia, kingdom Animalia - taxonomic kingdom comprising all living or extinct animals metazoan - any animal of the subkingdom Metazoa; all animals except protozoans and sponges Cnidaria, Coelenterata, phylum Cnidaria, phylum Coelenterata - hydras; polyps; jellyfishes; sea anemones; corals subkingdom - (biology) a taxonomic group comprising a major division of a kingdom |
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