Definition of

Hexahedron

Hexahedron
Hexahedron

A polyhedron with 6 (Hexa-) sides.

A cuboid is a hexahedron.

A cube is a regular hexahedron, as all sides are equal and all angles are equal.

There are many others.

Play with one here:

../geometry/images/polyhedra.js?mode=cuboid
See: Cuboid