Polyhedron (noun)

A solid shape in Euclidean geometry that is defined by its polygonal faces, or faces that are flat polygons, and the straight lines connecting them.

Origin:

From the greek "poly" meaning "many" and "edron" meaning "base".

Examples:

1. A cube is an example of a polyhedron, as it is defined by its six square faces.
2. A polyhedron can have any number of faces, and it can be convex or concave.
3. A polyhedron can be classified by the number of faces it has, such as a tetrahedron (4 faces), a hexahedron (6 faces), and an octahedron (8 faces).
4. A polyhedron can be regular or irregular, if all of its faces are congruent regular polygons, it's considered a regular polyhedron.
5. The study of polyhedrons is known as polyhedronology, and it has applications in various fields such as engineering, chemistry and computer graphics.