Cube,

Cube, a solid bounded by six equal square faces, opposite pairs of which are parallel; the three edges meeting at any point being at right angles to one another. This form frequently occurs in nature, especially among crystals (see CRYSTALLOGRAPHY). In arithmetic, the cube of a number is the product of its multiplication three times by itself; if the edge of a cube be a line of 4 inches, its solid content is 64 cubic inches. The cube root of a number is that number which, multiplied three times by itself, produces the first number. See INVOLUTION, ROOT, DOUBLING THE CUBE.