## In geometry|lang=en terms the difference between octahedron and tetrahedron

is that

**octahedron** is (geometry) a polyhedron with eight faces; the regular octahedron has regular triangles as faces and is one of the platonic solids while

**tetrahedron** is (geometry) a polyhedron with four faces; the regular tetrahedron, the faces of which are equal equilateral triangles, is one of the platonic solids.

## As nouns the difference between **octahedron** and **tetrahedron**

is that

**octahedron** is (geometry) a polyhedron with eight faces; the regular octahedron has regular triangles as faces and is one of the platonic solids while

**tetrahedron** is (geometry) a polyhedron with four faces; the regular tetrahedron, the faces of which are equal equilateral triangles, is one of the platonic solids.