in some systems of classification, any of the very large subkingdom (Metazoa) made up of all animals whose bodies, originating from a single cell, are composed of many differentiated cells arranged into definite organs
adjective
of the metazoans
See metazoan in American Heritage Dictionary 4
(mĕtˌə-zōˈən)
noun
A multicellular animal of the subkingdom Metazoa, a division of the animal kingdom in traditional two-kingdom classification systems.