Source : Webster's Revised Unabridged Dictionary (1913)

Semicubical \Sem`i*cu"bic*al\, a. (Math.)
   Of or pertaining to the square root of the cube of a
   quantity.

   {Semicubical parabola}, a curve in which the ordinates are
      proportional to the square roots of the cubes of the
      abscissas.