(n.pl.) Those animals in which the protoplasmic mass, constituting the egg, is converted into a multitude of cells, which are metamorphosed into the tissues of the body. A central cavity is commonly developed, and the cells around it are at first arranged in two layers, -- the ectoderm and endoderm. The group comprises nearly all animals except the Protozoa.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). metazoa. Retrieved September 25, 2026, from http://smartdefine.org/metazoa/definitions/2032312 |
| Chicago | Webster's. 2011. "metazoa" http://smartdefine.org/metazoa/definitions/2032312 (accessed September 25, 2026). |
| Harvard | Webster's 2011, metazoa, Smart Define, viewed 25 September, 2026, <http://smartdefine.org/metazoa/definitions/2032312>. |
| MLA | Webster's. "metazoa" 27 May 2011. Web. 25 September 2026. <http://smartdefine.org/metazoa/definitions/2032312> |