A subkingdom of the kingdom Animalia, including all multicellular animal organisms in which the cells are differentiated and form tissues; distinguished from the subkingdom Protozoa, or unicellular animal organisms. [meta- + G. zoon, animal]
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meta·zoa .met-ə-'zō-ə n pl
2) animals that are metazoans
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Meta·zoa (met″ə-zoґə) [meta- + Gr. zōon animal] that division of the animal kingdom which includes all multicellular animals whose cells become differentiated to form tissues. It comprises all animals except Protozoa.Medical dictionary. 2011.