heptakaidecahedron

plural heptakaidecahedra

1. Synonym of heptadecahedron.

   Other clathrates are the Br₂ hydrate with a pentakaidecahedral cage of water molecules or the tert-butylamine hydrate with a heptakaidecahedron cage of water molecules.

   1976, Peter Schuster, Georg Zundel, Camille Sandorfy, The Hydrogen Bond: Recent Developments in Theory and Experiments, volumes III (Dynamics, Thermodynamics and Special Systems), North-Holland Publishing Company, →ISBN, page 1416

   2 more examples

   The lacunar pattern of this grain therefore includes six tetragonal and nine hexagonal faces. Relating this to polyhedrons, we find that no pentakaidecahedron with such a combination of faces can exist (see page 199). If, however, the two polar areas be regarded as filled-in hexagonal lacunae, making 17 lacunae in all, the pattern corresponds to a heptakaidecahedron with 6 tetragonal and 11 hexagonal faces, which appears to be the proper interpretation of this pattern.

   1935, R[oger] P[hilip] Wodehouse, “Angiospermae”, in Pollen Grains: Their structure, identification and significance in science and medicine, New York, N.Y.; London: McGraw-Hill Book Company, Inc., part II (Classification), section “Dicotyledons”, subsection “Compositae”, subsubsection “Cichorieae”, page 481

   The host lattice consists of 156 water molecules per unit cell, which form 16 identical heptakaidecahedra (17-hedra) and 12 identical octahedra (8-hedra) in a face sharing arrangement with cubic symmetry.

   c. 1967, Structure Reports, International Union of Crystallography, page 290

   Synonyms: heptadecahedron