# octahedron

[ok-tuh-hee-druh n] /ˌɒk təˈhi drən/
noun, plural octahedrons, octahedra
[ok-tuh-hee-druh] /ˌɒk təˈhi drə/ (Show IPA)
1.
a solid figure having eight faces.
Origin of octahedron
1560-1570
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. 2016.
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Examples from the Web for octahedron
Historical Examples
• Of the stauraxonia isopola we have, for instance, the double pyramids, one of the simplest forms of the octahedron.

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

• Two of these generate the cube and the octahedron; five of these generate the dodecahedron and the icosahedron.

Annie Besant and Charles W. Leadbeater
• It may be derived from the octahedron by suppressing the alternate faces.

• That for the tetrahedron has 12 for its order, for the cube (or octahedron) 24, and for the icosahedron (or dodecahedron) 60.

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

Orange Jacobs
• These give the solid angles of the tetrahedron, the octahedron and the icosahedron.

• It is not difficult for a class to find the relative areas of the cube and the inscribed tetrahedron and octahedron.

David Eugene Smith
• Inscribe an octahedron in Venus, the circle inscribed in it will be Mercury.

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

David Eugene Smith
British Dictionary definitions for octahedron

## octahedron

/ˌɒktəˈhiːdrən/
noun (pl) -drons, -dra (-drə)
1.
a solid figure having eight plane faces
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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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
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octahedron in Science
 octahedron   (ŏk'tə-hē'drən)    Plural octahedrons or octahedraA polyhedron that has eight faces.
The American Heritage® Science Dictionary
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### Difficulty index for octahedron

Few English speakers likely know this word

### Word Value for octahedron

0
17
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