The Collaborative International Dictionary of English v.0.48:
Cubic \Cu"bic\ (k?"b?k), Cubical \Cu"bic*al\ (-b?-kal), a. [L.
cubicus, Gr. ?????: cf. F. cubique. See Cube.]
1. Having the form or properties of a cube; contained, or
capable of being contained, in a cube.
2. (Crystallog.) Isometric or monometric; as, cubic cleavage.
Cubic equation, an equation in which the highest power of
the unknown quantity is a cube.
Cubic foot, a volume equivalent to a cubical solid which
measures a foot in each of its dimensions.
Cubic number, a number produced by multiplying a number
into itself, and that product again by the same number.
Cubical parabola (Geom.), two curves of the third degree,
one plane, and one on space of three dimensions.