The Collaborative International Dictionary
Triakisoctahedron
Triakisoctahedron \Tri"a*kis*oc`ta*he"dron\, n. [Gr. ? thrice + E. octahedron.] (Crystalloq.) A trigonal trisoctahedron.
Wiktionary
triakisoctahedron
n. (context crystallography English) A trigonal trisoctahedron.