Definitions

from The Century Dictionary.

  • noun In embryology, the portion of the mesoderm from which the walls of the pleuroperitoneal cavity of vertebrates arise.
  • noun 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.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

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

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