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# polyhedron

[pol-ee-hee-druh n]
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noun, plural pol·y·he·drons, pol·y·he·dra [pol-ee-hee-druh] /ˌpɒl iˈhi drə/.
1. a solid figure having many faces.

## Origin of .css-1fxfie5{font-size:22px;}@media (max-width:768px){.css-1fxfie5{font-size:18px;margin:0 10px 10px 0;word-break:break-all;word-wrap:break-word;-webkit-hyphens:auto;-moz-hyphens:auto;-ms-hyphens:auto;hyphens:auto;line-height:22px;}}polyhedron

1560–70; < Greek polýedron, neuter of polýedros having many bases. See poly-, -hedron
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 Geometry

Peter Ramus

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

The Teaching of Geometry

David Eugene Smith

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

British Dictionary definitions for polyhedron

# polyhedron

noun plural -drons or -dra (-drə)
1. 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

## 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 forpolyhedron

### n.

1560s, from Latinized form of Greek polyedron, neuter of adjective polyedros "having many bases or sides," from polys "many" (see poly-) + hedra "seat, base, chair, face of a geometric solid," from PIE root *sed- (1) "to sit" (see sedentary).

Online Etymology Dictionary, © 2010 Douglas Harper

polyhedron in Science

# polyhedron

[pŏl′ē-hēdrən]
Plural polyhedrons polyhedra
1. 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.