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[ok-tuh-hee-druh n] /ˌɒk təˈhi drən/
noun, plural octahedrons, octahedra
[ok-tuh-hee-druh] /ˌɒk təˈhi drə/ (Show IPA)
a solid figure having eight faces.
Origin of octahedron
1560-70; < Greek oktáedron eight-sided (neuter of oktáedros), equivalent to okta- octa- + -edron -hedron Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for octahedron
  • All faces of a regular octahedron are congruent, equilateral triangles.
  • The relative lengths of the facets suggest a polyhedral morphology approximately halfway between an octahedron and a cube.
  • For example, diamonds maybe cleaved in four directions parallel to the faces of an octahedron.
British Dictionary definitions for octahedron


noun (pl) -drons, -dra (-drə)
a solid figure having eight plane faces
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
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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.

Online Etymology Dictionary, © 2010 Douglas Harper
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octahedron in Science
Plural octahedrons or octahedra
A polyhedron that has eight faces.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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