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Definition of Metazoa
1. Noun. Multicellular animals having cells differentiated into tissues and organs and usually a digestive cavity and nervous system.
Group relationships: Animal Kingdom, Animalia, Kingdom Animalia
Member holonyms: Metazoan, Cnidaria, Coelenterata, Phylum Cnidaria, Phylum Coelenterata
Generic synonyms: Subkingdom
Definition of Metazoa
1. n. pl. 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.
Definition of Metazoa
1. metazoon [n] - See also: metazoon
Medical Definition of Metazoa
1.