semicubical

from The Century Dictionary.

• Of the degree whose exponent is now used only in the expression semicubical parabola—that is, a parabola whose equation is . See parabola.

from the GNU version of the Collaborative International Dictionary of English.

• adjective (Math.) Of or pertaining to the square root of the cube of a quantity.
• adjective a curve in which the ordinates are proportional to the square roots of the cubes of the abscissas.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• adjective mathematics Of or relating to the square root of the cube of a quantity.