[ pol-ee-hee-druh l ]
/ ˌpɒl iˈhi drəl /


of, relating to, or having the shape of a polyhedron.

Origin of polyhedral

1805–15; < Greek polýedr(os) many-based (see polyhedron) + -al1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for polyhedral

Science definitions for polyhedral


[ pŏl′ē-hēdrən ]

Plural polyhedrons polyhedra

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.

Related forms

polyhedral adjective
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.