Noun:

எண்முக முக்கோணகம்,

octahedron's Usage Examples:

1 shows P the cube {100}, d the octahedron {III }, and e the pentagonal dodecahedron {210}.

The " small rhombicuboctahedron " is bounded by 12 pentagonal, 8 triangular and 6 square faces; the " great rhombicuboctahedra " by 12 decagonal, 8 triangular and 6 square faces.

Diamond may break with a conchoidal fracture, but the crystals always cleave readily along planes parallel to the octahedron faces: of this property the diamond cutters avail themselves when reducing the stone to the most convenient form for cutting; a sawing process, has, however, now been introduced, which is preferable to that of cleavage.

Marsh also devised a form closely resembling that of Thomsen, inasmuch as the carbon atoms occupied the angles of a regular octahedron, and the diagonal linkages differed in nature from the peripheral, but differeng from Thomsen's since rupture of the diagonal and not peripheral bonds accompanied the reduction to hexamethylene.

Two such sets placed base to base form the octahedron, which consequently has 8 faces, 6 vertices and 12 edges.

They are cubic in crystallization, with the cube and the octahedron as prominent forms, but crystals are small and usually indistinct; there is no cleavage.

Ladenburg's prism formula would give two enantiomorphic ortho-di-substitution derivatives; while forms in which the hydrogen atoms are placed at the corners of a regular octahedron would yield enantiomorphic tri-substitution derivatives.

The regular octahedron has for its faces equilateral triangles; it is the reciprocal of the cube.

Nevertheless, holding that every dimension has a principle of its own, he rejected the derivation of the elemental solids - pyramid, octahedron, icosahedron and cube - from triangular surfaces, and in so far approximated to atomism.

A yellowish octahedron found at De Beers weighed 4282 carats, and yielded a brilliant of 2882 carats.

We may also note that of the Archimedean solids: the truncated tetrahedron, truncated cube, and truncated dodecahedron, are the reciprocals of the crystal forms triakistetrahedron, triakisoctahedron and triakisicosahedron.

similar to the " etched figures " produced 7' by moistening an octahedron of alum, and have probably been produced, like them, by the action of some solvent.

6) are united by contact along a surface parallel to an octahedron face without interpenetration.

Synonyms:

polyhedron,

Antonyms:

None