单词	metazoan
释义	metazoan noun meta·​zo·​an ˌme-tə-ˈzō-ən  : 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 metazoan adjective Example Sentences Recent Examples on the Web Meanwhile, Knauth theorizes, oxygen-utilizing metazoans could have evolved on moist mats of oxygen producers kept hydrated by rains, lakes, streams and rivers during the late Precambrian. Peter Byrne, Quanta Magazine, 24 Apr. 2014 Word History Etymology New Latin Metazoa, from meta- + -zoa First Known Use 1879, in the meaning defined above Medical Definition metazoan noun meta·​zo·​an -ˈzō-ən  : 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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