Lexic.us

Definition of Hemihedral

1. a. Having half of the similar parts of a crystals, instead of all; consisting of half the planes which full symmetry would require, as when a cube has planes only on half of its eight solid angles, or one plane out of a pair on each of its edges; or as in the case of a tetrahedron, which is hemihedral to an octahedron, it being contained under four of the planes of an octahedron.

Definition of Hemihedral

1. Adjective. (context: of a crystal) Having only half the plane faces needed for the highest degree of symmetry in its system ¹

¹ Source: wiktionary.com

Definition of Hemihedral

1. [adj]

Medical Definition of Hemihedral

1. Having half of the similar parts of a crystals, instead of all; consisting of half the planes which full symmetry would require, as when a cube has planes only on half of its eight solid angles, or one plane out of a pair on each of its edges; or as in the case of a tetrahedron, which is hemihedral to an octahedron, it being contained under four of the planes of an octahedron. Hemihe"drally. Origin: Hemi- + Gr. Seat, base, fr. To sit. Source: Websters Dictionary (01 Mar 1998)

Lexicographical Neighbors of Hemihedral

Literary usage of Hemihedral

Below you will find example usage of this term as found in modern and/or classical literature:

1. The Encyclopaedia Britannica: A Dictionary of Arts, Sciences, and General by Thomas Spencer Baynes (1888)
"47), hemihedral of the octahedron, is bounded by four equilateral triangles. ... 47. Fig. 48. S. The deltoid dodecahedrons (6g. 49), hemihedral of the ..."

2. Handbook of Mineralogy, Blowpipe Analysis, and Geometrical Crystallography by Gurdon Montague Butler (1911)
"Sphenoidal hemihedral forms may be conceived to be developed by dividing each of ... Sphenoidal hemihedral forms possess only two interchangeable secondary ..."

3. Elements of Chemical Physics by Josiah Parsons Cooke (1873)
"It is, therefore, a hemihedral form. This form is called the tetrahedron, ... Hence, it is frequently called the hemihedral form of the octahedron. ..."

4. A System of Crystallography, with Its Application to Mineralogy by John Joseph Griffin (1841)
"If there are two kinds of octants, a hemihedral form is present. ... It only remains to be added, that the planes of all hemihedral and ..."

5. A Manual of Geometrical Crystallography, Treating Solely of Those Portions by Gurdon Montague Butler (1918)
"PYRAMIDAL hemihedral DIVISION Development or Derivation of the Forms. Pyramidal hemihedral hexagonal forms may be conceived to be developed by dividing each ..."

6. Elementary Crystallography: Being Part One of General Mineralogy by William Shirley Bayley (1910)
"It demands simply that the new hemihedral forms shall affect the two ends of the vertical axis similarly and the several ends of the lateral axes. ..."

Other Resources: