# 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

#### 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

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
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

## 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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The American Heritage® Science Dictionary
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