English definition of Hemihedral

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Definition of hemihedral

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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..

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Tetrahedral :: Tetrahedral (a.) Pertaining or related to a tetrahedron, or to the system of hemihedral forms to which the tetrahedron belongs..

Hemiholohedral :: Hemiholohedral (a.) Presenting hemihedral forms, in which half the sectants have the full number of planes..

Hemihedrism :: Hemihedrism (n.) The property of crystallizing hemihedrally.

Pyritohedral :: Pyritohedral (a.) Like pyrites in hemihedral form.

Enantiomorphous :: 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 :: 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..

Gyroidal :: 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 :: Deltohedron (n.) A solid bounded by twelve quadrilateral faces. It is a hemihedral form of the isometric system, allied to the tetrahedron..

Sphenoid :: Sphenoid (n.) A wedge-shaped crystal bounded by four equal isosceles triangles. It is the hemihedral form of a square pyramid.

Diploid :: Diploid (n.) A solid bounded by twenty-four similar quadrilateral faces. It is a hemihedral form of the hexoctahedron.

Holohedral :: Holohedral (a.) Having all the planes required by complete symmetry, -- in opposition to hemihedral..

Hemihedron :: Hemihedron (n.) A solid hemihedrally derived. The tetrahedron is a hemihedron.

Holohemihedral :: Holohemihedral (a.) Presenting hemihedral forms, in which all the sectants have halt the whole number of planes..