• synonyms


[pol-ee-hee-druh l]
  1. of, relating to, or having the shape of a polyhedron.
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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. 2018

Examples from the Web for polyhedral

Historical Examples

  • A tumor of stellate or polyhedral cells in a matrix of mucin.

    Surgery, with Special Reference to Podiatry

    Maximilian Stern

  • Suppose the polyhedral angle were concave, why would the proof not hold?

    The Teaching of Geometry

    David Eugene Smith

  • Directly superposed to these we find cells which in shape are polyhedral.

    Diseases of the Horse's Foot

    Harry Caulton Reeks

  • In all such cases the relation to the polyhedral angle should be made clear.

    The Teaching of Geometry

    David Eugene Smith

  • The angle between two planes is termed dihedral, between three trihedral, between any number more than three polyhedral.

Word Origin and History for polyhedral


1741, from polyhedron + -al (1).

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Online Etymology Dictionary, © 2010 Douglas Harper

polyhedral in Science


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