Sursolid
SURSOL'ID, noun [sur and solid, or surdesolid.] In mathematics, the fifth power of a number; or the product of the fourth multiplication of a number considered as the root. Thus 3x3=9, the square of 3, and 9x3=27, the third power or cube, and 27x3=81, the fourth power, and 81x3=243, which is the sursolid of 3.
SURSOL'ID, adjective Denoting the fifth power.
Sursolid problem, is that which cannot be resolved but by curves of a higher kind than the conic sections.