octahedron

[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.

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

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British Dictionary definitions for octahedron

octahedron

noun plural -drons or -dra (-drə)
  1. 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

Word Origin and History for octahedron
n.

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

octahedron in Science

octahedron

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