Skip to main content Skip to Search Box

Definition: octahedron (plural octahedra) from The Penguin Dictionary of Mathematics

A polyhedron that has eight faces. A regular octahedron, in which all the faces are equilateral triangles, is one of the five regular polyhedra.

Summary Article: octahedron, regular from The Hutchinson Unabridged Encyclopedia with Atlas and Weather Guide

Regular solid with eight faces, each of which is an equilateral triangle. It is one of the five regular polyhedra or Platonic solids. The figure made by joining the midpoints of the faces is a perfect cube and the vertices of the octahedron are themselves the midpoints of the faces of a surrounding cube. For this reason, the cube and the octahedron are called dual solids.


octahedron, regular

© RM, 2016. All rights reserved.

Related Credo Articles

Full text Article octahedron
The Penguin English Dictionary

/oktəheedrən/ noun ( pl octahedrons octahedra /-drə/ ) a polyhedron with eight faces octahedral adj . ...

Full text Article octahedron
Merriam-Webster's Collegiate(R) Dictionary

pronunciation (1570) : a solid bounded by eight plane faces

Full text Article Platonic solid
Collins English Dictionary

n 1 any of the five possible regular polyhedra: cube, tetrahedron, octahedron, icosahedron, and dodecahedron Also called (esp formerly): Platonic b

See more from Credo