Search:hemihedral -> HEMIHEDRAL
hemihedral
h e m i h e d r a l hex:#104;#101;#109;#105;#104;#101;#100;#114;#97;#108;
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- Hemihedral - 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.
- Hemiholohedral - a. - Presenting hemihedral forms, in which half the sectants have the full number of planes.
- Holohemihedral - a. - Presenting hemihedral forms, in which all the sectants have halt the whole number of planes.
- Sphenoid - n. - A wedge-shaped crystal bounded by four equal isosceles triangles. It is the hemihedral form of a square pyramid.
- Tetrahedral - a. - Pertaining or related to a tetrahedron, or to the system of hemihedral forms to which the tetrahedron belongs.
- Pyritohedral - a. - Like pyrites in hemihedral form.
- Gyroidal - a. - Having the planes arranged spirally, so that they incline all to the right (or left) of a vertical line; -- said of certain hemihedral forms.
- Deltohedron - n. - A solid bounded by twelve quadrilateral faces. It is a hemihedral form of the isometric system, allied to the tetrahedron.
- Enantiomorphous - a. - Similar, but not superposable, i. e., related to each other as a right-handed to a left-handed glove; -- said of certain hemihedral crystals.
- Hemihedral - 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.
- Diploid - n. - A solid bounded by twenty-four similar quadrilateral faces. It is a hemihedral form of the hexoctahedron.