Hemihedral definition

hĕmĭ-hēdrəl
Exhibiting only half the faces required for complete symmetry. Used of a crystal.
adjective
0
0
Having half the number of faces required for complete symmetry.
adjective
0
0
(of a crystal) Having only half the plane faces needed for the highest degree of symmetry in its system.
adjective
0
0
Advertisement

Hemihedral Sentence Examples

  • This is one of the Platonic solids, and is treated in the article Polyhedron, as is also the derived Archimedean solid named the "truncated tetrahedron"; in addition, the regular tetrahedron has important crystallographic relations, being the hemihedral form of the regular octahedron and consequently a form of the cubic system.

  • The bisphenoids (the hemihedral forms of the tetragonal and rhombic bipyramids)., and the trigonal pyramid of the hexagonal system, are examples of non-regular tetrahedra (see Crystallography).

  • Iron pyrites, or pyrite, belongs crystallographically to the parallelfaced hemihedral class of the cubic system.

  • A polyhedron is said to be the hemihedral form of another polyhedron when its faces correspond to the alternate faces of the latter or holohedral form; consequently a hemihedral form has half the number of faces of the holohedral form.

  • Hemihedral forms are of special importance in crystallography, to which article the reader is referred for a fuller explanation of these and other modifications of polyhedra (tetartohedral, enantiotropic, &c.).

More sentences

Related articles

Words near hemihedral in the Dictionary