from The Century Dictionary.

  • noun In sponges, the outer region, forming the roof and walls of the subdermal chambers, composed of ectoderm and a superficial layer of endoderm; the cortex: distinguished from choanosome and endosome.
  • noun In cytology, one of the deeply staining granules eliminated from the chromatin of the nuclei of the germ-track during their karyokinetic divisions.


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