from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A part that the walls of a pleuroperitoneal cavity grow.

from The Century Dictionary and Cyclopedia

  • n. That lower part of some sponges which has all three fundamental layers, ectoderm, mesoderm, and endoderm, but develops no flagellated chambers or choanosome: distinguished from spongomere.
  • n. In embryology, the portion of the mesoderm from which the walls of the pleuroperitoneal cavity of vertebrates arise.


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