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Metazoa - Dictionary Definition and Overview |
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Metazoa : (noun)
1: multicellular animals having cells differentiated into
tissues and organs and usually a digestive cavity and
nervous system [syn: Metazoa, subkingdom Metazoa]
Based on WordNet 2.0
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Metazoa : \Met`a*zo"a\, n. pl. [NL., fr. Gr. ? after _ ? an
animal.] (Zo["o]l.)
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.
Based on WordNet (r) 2.0 (August 2003)
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