METAZOAN

metazoan

Noun

  1. 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.


The above text is a snippet from Wiktionary: metazoan
and as such is available under the Creative Commons Attribution/Share-Alike License.

Need help with a clue?
Try your search in the crossword dictionary!