hexadecachoron

noun1

1. •
   A four-dimensional object analogous to an octahedron, constructed out of sixteen tetrahedra.

   • In a world with four spatial dimensions, for example, we can construct only six regular solids, viz pentatope, tesseract, hexadecachoron, icositetrachoron, hecatonicosachoron and hexacosichoron. — 2005