noun, plural octahedrons, octahedra [ok-tuh-hee-druh] .
a solid figure having eight faces.

1560–70; < Greek oktáedron eight-sided (neuter of oktáedros), equivalent to okta- octa- + -edron -hedron

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World English Dictionary
octahedron (ˌɒktəˈhiːdrən)
n , pl -drons, -dra
a solid figure having eight plane faces

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

from Gk. oktahedron, neut. of oktahedros "eight-sided," from okta- "eight" (see octa-) + hedra "seat" (see sedentary).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
octahedron   (ŏk'tə-hē'drən)  Pronunciation Key 
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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Example sentences
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.
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