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from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. (in annelids etc) a large cell at the growing end of many embryos that produces many smaller cells

from The Century Dictionary and Cyclopedia

  • n. In embryology, one of the large cells situated at the posterior growing end of the body in certain annelids and arthropods and budding forth anteriorly a row of cells which proliferates to form one of the definitive series of organs such as the nerve-chain, nephridia, and mesoblastic somites.


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