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from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. The hard, triangular apex of a graptolite from which it grows.

from The Century Dictionary and Cyclopedia

  • n. In the graptolites, the triangular stiletto-shaped body at the proximal end of a polypary, representing the primary theca or zoöid of the colony.


Sorry, no etymologies found.



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