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metazoa n. 后生动物 後生动物 Metazoa n 1: multicellular animals having cells differentiated into tissues and organs and usually a digestive cavity and nervous system [synonym: {Metazoa}, {subkingdom Metazoa}] Metazoa \Met`a*zo"a\, n. pl. [NL., fr. Gr. ? after zo^,on an
animal.] (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. [1913 Webster]
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