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.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.
metazoanA multicellular “animal”.
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.
metazoanany 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.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005