from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Having six rays
  • n. A six-rayed spicule, made of silica, that makes up the skeleton of some sponges

from The Century Dictionary and Cyclopedia

  • Having six rays: same as hexactinal.
  • Having the characters of or pertaining to a hexactine.
  • Hexactinellidan.
  • n. In the nomenclature of the spicular elements of sponges, a six-rayed or triaxial form typically expressed as six arms at right angles to one another.


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