# polyhedron

[pol-ee-hee-druh n]

- a solid figure having many faces.

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## Origin of polyhedron

Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

## Examples from the Web for polyhedron

### Historical Examples of polyhedron

The division of a Polyhedron ariseth from the bases upon which it standeth.

The Way To GeometryPeter Ramus

"Polyhedron" is from the Greek polys (many) and hedra (seat).

The Teaching of GeometryDavid Eugene Smith

Such a polyhedron (πολύς, many, ἕδρα, base or face) is known as a crystal.

The points thus obtained are evidently the vertices of a polyhedron with plane faces.

Synacral, sin-ak′ral, adj. having a common vertex, as faces of a polyhedron.

## polyhedron

- a solid figure consisting of four or more plane faces (all polygons), pairs of which meet along an edge, three or more edges meeting at a vertex. In a regular polyhedron all the faces are identical regular polygons making equal angles with each other. Specific polyhedrons are named according to the number of faces, such as tetrahedron, icosahedron, etc

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## Word Origin for polyhedron

C16: from Greek poluedron, from poly- + hedron side, base

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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## Word Origin and History for polyhedron

Online Etymology Dictionary, © 2010 Douglas Harper

## polyhedron

[pŏl′ē-hē′drən]

- A three-dimensional geometric figure whose sides are polygons. A tetrahedron, for example, is a polyhedron having four triangular sides.♦ A regular polyhedron is a polyhedron whose faces are all congruent regular polygons. The regular tetrahedron (pyramid), hexahedron (cube), octahedron, dodecahedron, and icosahedron are the five regular polyhedrons. Regular polyhedrons are a type of Archimedean solid.

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