Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. Germinal tissue of Porifera that forms cores or developing mesoderms.

from The Century Dictionary and Cyclopedia

  • n. In sponges, an indifferent germinal tissue forming the core or primitive mesoderm whence the true mesoderm and the endoderm both arise.

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

cœn- +‎ o conjuncted with blast, from Ancient Greek: κοινός (koinos, "common") combined with βλαστός (vlastos, "germ").

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