Definition:Octahedron
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Definition
An octahedron is a polyhedron which has $8$ faces.
Regular Octahedron
A regular octahedron is an octahedron whose $8$ faces are all congruent equilateral triangles.
Also see
- Results about octahedra can be found here.
Linguistic Note
The word octahedron derives from the Classical Greek:
- octo (ὀκτώ), meaning eight
- hedron (a form of ἕδρα), meaning base or seat.
The technically correct plural of octahedron is octahedra, but the word octahedrons can often be found.
Sources
- 1989: Ephraim J. Borowski and Jonathan M. Borwein: Dictionary of Mathematics ... (previous) ... (next): octahedron
- 1998: David Nelson: The Penguin Dictionary of Mathematics (2nd ed.) ... (previous) ... (next): octahedron (plural octahedra)
- 2008: David Nelson: The Penguin Dictionary of Mathematics (4th ed.) ... (previous) ... (next): octahedron (plural octahedra)
- 2014: Christopher Clapham and James Nicholson: The Concise Oxford Dictionary of Mathematics (5th ed.) ... (previous) ... (next): octahedron (octahedra)