equimomental

from The Century Dictionary.

• In physics, having equal moments of inertia about, parallel axes, or axes which may be brought, into parallelism, all at once.

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

• adjective (Mech.) Having equal moments of inertia.
• adjective a conical surface that has any given vertex, and is described by a straight line which moves in such manner that the moment of inertia of the given rigid body about the line is in all its positions the same.

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

• adjective Having equal moments of inertia.