• synonyms


[ok-tuh-hee-druh n]
noun, plural oc·ta·he·drons, oc·ta·he·dra [ok-tuh-hee-druh] /ˌɒk təˈhi drə/.
  1. a solid figure having eight faces.
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Origin of octahedron

1560–70; < Greek oktáedron eight-sided (neuter of oktáedros), equivalent to okta- octa- + -edron -hedron
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for octahedron

Historical Examples

  • The Octahedron, having eight equilateral triangles as faces.

    Bygone Beliefs

    H. Stanley Redgrove

  • Combinations of the cube and octahedron are shown in figs. 6-8.

  • It may be derived from the octahedron by suppressing the alternate faces.

  • The other piece of money in circulation was octahedron in shape or form.

  • A cube may be inscribed in an octahedron, its vertices being at the centers of the faces of the octahedron.

    The Teaching of Geometry

    David Eugene Smith

British Dictionary definitions for octahedron


noun plural -drons or -dra (-drə)
  1. a solid figure having eight plane faces
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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 octahedron


1560s, from Greek oktahedron, neuter of oktahedros "eight-sided," from okta- "eight" (see octa-) + hedra "seat" (see sedentary). Related: Octahedral.

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Online Etymology Dictionary, © 2010 Douglas Harper

octahedron in Science


Plural octahedrons octahedra
  1. A polyhedron that has eight faces.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.