octahedron

As a noun octahedron

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

As an adjective undefined is

lacking a definition or value.

In geometry terms the difference between octahedron and hexahedron

is that octahedron is a polyhedron with eight faces; the regular octahedron has regular triangles as faces and is one of the Platonic solids while hexahedron is a polyhedron with six faces; the regular hexahedron is more commonly called the cube and is one of the Platonic solids.

In geometry terms the difference between pyramid and octahedron

is that pyramid is a solid with triangular lateral faces and a polygonal (often square or rectangular) base while octahedron is a polyhedron with eight faces; the regular octahedron has regular triangles as faces and is one of the Platonic solids.

As nouns the difference between pyramid and octahedron

is that pyramid is an ancient massive construction with a square or rectangular base and four triangular sides meeting in an apex, such as those built as tombs in Egypt or as bases for temples in Mesoamerica while octahedron is a polyhedron with eight faces; the regular octahedron has regular triangles as faces and is one of the Platonic solids.

As a verb pyramid

is to combine (a series of genes) into a single genotype.

As nouns the difference between rhombohedron and octahedron

is that rhombohedron is a prism with six faces, each a rhombus while octahedron is a polyhedron with eight faces; the regular octahedron has regular triangles as faces and is one of the Platonic solids.

is likely misspelled.

has no English definition.

As a noun octahedron

is a polyhedron with eight faces; the regular octahedron has regular triangles as faces and is one of the Platonic solids.

As a noun octahedron

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

As an adjective tetrahedral is

in the shape of a tetrahedron.

As nouns the difference between chronic and octahedron

is that chronic is marijuana, typically of high quality while octahedron is a polyhedron with eight faces; the regular octahedron has regular triangles as faces and is one of the Platonic solids.

As an adjective chronic

is of a problem, that continues over an extended period of time.

As nouns the difference between octaedron and octahedron

is that octaedron is an alternative spelling of octahedron while octahedron is a polyhedron with eight faces; the regular octahedron has regular triangles as faces and is one of the Platonic solids.

In geometry terms the difference between octahedron and tetrahedron

is that octahedron is a polyhedron with eight faces; the regular octahedron has regular triangles as faces and is one of the Platonic solids while tetrahedron is a polyhedron with four faces; the regular tetrahedron, the faces of which are equal equilateral triangles, is one of the Platonic solids.