noun
octahedron
ok-tuh-HEE-drun
Octahedron (noun) means a solid shape with eight flat faces. Example: “The dice used in some board games are shaped like an octahedron.”
noun
1
A solid shape with eight flat faces.
"The dice used in some board games are shaped like an octahedron."
"Each face of a regular octahedron is an equilateral triangle."
"The crystal had grown into a near-perfect octahedron."
How to use octahedron
Learner’s notesIn plain EnglishAn eight-sided solid shape, often made of triangles.
When to use it
The word belongs to geometry and is mostly used in mathematical or scientific contexts.
Memory tip
Remember octa- means eight, the same root as in octopus and October.
Trace the full origin ↓
Common pairings
regular octahedron
shaped like an octahedron
a die in the form of an octahedron
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Etymology
From Ancient Greek oktáedron, by surface analysis octa- + -hedron.
Rhymes for octahedron
See all rhymes for octahedron →Frequently asked questions
What is an octahedron?
It is a solid shape with eight faces. When all the faces are identical equilateral triangles, it is called a regular octahedron.
Is an octahedron a Platonic solid?
Yes, the regular octahedron, with eight equilateral triangle faces, is one of the five Platonic solids.
What is the plural of octahedron?
Both octahedra and octahedrons are used as the plural.
What is the meaning of octahedron?
"octahedron" (noun) means a solid shape with eight flat faces.
