Definitions
metazoan Tweet Definition of metazoan Like Definition of metazoan on Facebook
noun 
  1. (zoology): Any animal that undergoes development from an embryo stage with three tissue layers, namely the ectoderm, mesoderm, and endoderm. The term applies to all animals except the sponges.
adjective 
  1. Having to do with animals that develop from an embryo with three tissue layers.

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