from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Being trigonal in two different ways on the same axis; i.e., of a six-sided object, having only the alternate interfacial angles equal

from The Century Dictionary and Cyclopedia

  • In crystallography, twice-three-sided. A ditrigonal prism is a six-sided prism, the hemihedral form of a twelve-sided or dihexagonal prism.
  • Noting a type of symmetry characterized by a trigonal axis (that is, one of threefold symmetry), in which axis three planes of symmetry intersect. See symmetry.


From di- +‎ trigonal (Wiktionary)


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