Noah Webster
Cubical
CUBIC, CUBICAL adjective [Latin See Cube.] Having the form or properties of a cube; that may be or is contained within a cube. A cubic foot of water is the water that may be contained within six equal sides, each a foot square.
Cubic number, is a number produced by multiplying a number into itself, and that product by the same number; or it is the number arising from the multiplication of a square number by its root. [See Cube.]