tristetrahedron Geom. and Cryst.
(ˌtrɪstɛtrəˈhiːdrɔːn, -ˈhɛdrən)
[f. tris- + tetrahedron.]
A solid figure having 12 faces, every three of which correspond to one face of the tetrahedron: either with triangular faces (= triakistetrahedron), or with trapezoidal faces. (Cf. trisoctahedron.)
| In recent Dicts. |