Metazoal | definition of metazoal by Medical dictionary
metazoan (redirected from metazoal)
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Any of numerous heterotrophic eukaryotic organisms of the kingdom Metazoa, characteristically having a multicellular body with cells differentiated into tissues; an animal.
met′a·zo′al, met′a·zo′an (met′a·zo′ic) adj.
metazoan A multicellular “animal”.
metazoan any animal of the group Metazoa, whose bodies are multicellular, as distinct from the PROTOZOANS where the bodies are unicellular. Sponges (see PARAZOAN).are the only nonprotozoan group excluded from the Metazoa. Most metazoans (except COELENTERATES) have a three-layered body structure with an outer ECTODERM, a middle MESODERM and an inner ENDODERM.