Math Definitions - Letter O


Definition of Octahedron

Definition of  Octahedron

An octahedron is a polyhedron. It has eight flat faces, and six vertices. Each face is a triangle.

We say that an octahedron is regular if each of its faces is an equilateral triangle. The regular octahedron is one of the Platonic solids.


The aim of this dictionary is to provide definitions to common mathematical terms. Students learn a new math skill every week at school, sometimes just before they start a new skill, if they want to look at what a specific term means, this is where this dictionary will become handy and a go-to guide for a student.


Year 1 to Year 12 students

Learning Objectives

Learn common math terms starting with letter O

Author: Subject Coach
Added on: 6th Feb 2018

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