octahedron

[ok-tuh-hee-druhn] Origin

oc·ta·he·dron

[ok-tuh-hee-druhn]
noun, plural oc·ta·he·drons, oc·ta·he·dra [-druh] .
a solid figure having eight faces.

Origin:
1560–70; < Greek oktáedron eight-sided (neuter of oktáedros), equivalent to okta- octa- + -edron -hedron
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Octahedron is always a great word to know.
So is quincunx. Does it mean:
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
Collins
World English Dictionary
octahedron (ˌɒktəˈhiːdrən)
 
n , pl -drons, -dra
a solid figure having eight plane faces

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

octahedron
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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