mutetrahedron

Etymology
Short for multiple tetrahedron.

Noun

 * 1)  A regular skew apeirohedron with six hexagons around each vertex, formed by an infinite number of truncated tetrahedron-like cells (specifically, truncated tetrahedra missing their triangle faces, with the resulting triangle-shaped holes joined to form empty spaces in the shape of faceless tetrahedra) in Euclidean 3D space.

Translations

 * Japanese: 六角六片三角孔ねじれ正多面体