Definition of metazoan
: any of a group (Metazoa) that comprises all animals having the body composed of cells differentiated into tissues and organs and usually a digestive cavity lined with specialized cells
Origin of metazoan
New Latin Metazoa, from meta- + -zoa
First Known Use: 1879
Medical Definition of metazoan
: any of the animals that comprise the taxon Metazoa, that have the body when adult composed of numerous cells differentiated into tissues and organs and usually a digestive cavity lined with specialized cells, and that usually include the coelenterates and all higher animals but sometimes also include the sponges and mesozoans
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Medical Dictionary: Definition of "metazoan"
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