octahedron

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octahedron:

see polyhedronpolyhedron
, closed solid bounded by plane faces; each face of a polyhedron is a polygon. A cube is a polyhedron bounded by six polygons (in this case squares) meeting at right angles.
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octahedron

[‚ak·tə′hē·drən]
(mathematics)
A polyhedron having eight faces, each of which is an equilateral triangle.

octahedron

a solid figure having eight plane faces