It is a term given to the eight sided polyhedron. All the sides of it are equidimensional and bisect at the same angle. Minerals of such shape belong to the isometric system. It is also known as Octahedra or Octahedrals in plural forms.

A solid figure contained by 8 equal and equilateral triangles.

A polyhedron that has eight faces, each of which is an equilateral triangle.

any polyhedron having eight plane faces

a four-sided pyramid with the tip facing the sky and a four-sided pyramid with the tip pointing down into the center of the earth

a regular solid with eight identical faces

a solid figure contained by eight equal and equilateral triangles

a solid figure enlosed by eight triangles that are equal, equal-sided

a solid shape with eight triangular faces, four of which meet at each corner

An eight-sided solid where each side is a triangle. One of the " Platonic primitives" Aladdin4D can generate. Octahedron

An object with eight surfaces.

An octahedron is an eight-sided geometric solid (a 3-D object). 1, 3, 5, 7, 9, 11, ...

A Platonic solid consisting of 8 triangular faces, 8 edges, and 6 vertices.

An octahedron (plural: octahedra) is a polyhedron with eight faces. A regular octahedron is a Platonic solid composed of eight equilateral triangles, four of which meet at each vertex.