tristetrahedronn.
/ˌtrɪstɛtrəˈhiːdrɔːn//ˌtrɪstɛtrəˈhɛdrən/ Geometry and Crystallography.
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A solid figure having 12 faces, every three of which correspond to one face of the tetrahedron: either with triangular faces (= triakistetrahedron at triakis- comb. form), or with trapezoidal faces. (Cf. trisoctahedron n.) (In recent dictionaries.)
This entry has not yet been fully updated (first published 1915; most recently modified version published online September 2018).
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n.1915