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Definition of octahedron : A solid bounded by eight faces. The regular octahedron is contained by eight equal equilateral triangles.

Synonyms:

dodecahedron, pentagon, parallelogram, polygon, octagon, scalene triangle, hexahedron, polyhedron, pentahedron, rectangle, tetragon, hexagon, trapezoid, right-angle triangle, cube, quadrilateral, equilateral triangle, triangle, rhombus, heptagon, dodecagon, cusp, square, tetragram, quadrangle, tetrahedron, isosceles triangle, decagon, parallelepiped

Usage examples:

• Crystallizes in the regular octahedron. - "The Elements of Blowpipe Analysis", Frederick Hutton Getman.
• A cube may be inscribed in an octahedron, its vertices being at the centers of the faces of the octahedron. - "The Teaching of Geometry", David Eugene Smith.