# 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.