from The Century Dictionary and Cyclopedia

  • Symmetrical with regard to one axis only, as the parabola in contradistinction to the ellipse and hyperbola.
  • Pertaining to or exhibiting hemisymmetry. See hemisymmetry, 2.
  • In crystallography, hemihedral; characterized by hemisymmetry, that is, by a grade of symmetry which requires only half the faces that belong to the corresponding form of the holosymmetric (holohedral) type. See symmetry.


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