The Collaborative International Dictionary of English v.0.48:

Cube \Cube\, v. t. [imp. & p. p. Cubed (k[=u]bd); p. pr. & vb.
   n. Cubing.]
   To raise to the third power; to obtain the cube of.
   [1913 Webster]

Moby Thesaurus II by Grady Ward, 1.0:

20 Moby Thesaurus words for "cubed":
   cube-shaped, cubic, cubiform, cuboid, diced, foursquare, oblong,
   orthogonal, quadrangular, quadrate, quadriform, quadrilateral,
   rectangular, rhombic, rhomboid, square, tetragonal, tetrahedral,
   trapezohedral, trapezoid