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tris- +‎ octahedron


trisoctahedron (plural trisoctahedrons or trisoctahedra)

  1. (crystallography) A solid of the isometric system bounded by 24 equal faces, three corresponding to each face of an octahedron.

Part or all of this entry has been imported from the 1913 edition of Webster’s Dictionary, which is now free of copyright and hence in the public domain. The imported definitions may be significantly out of date, and any more recent senses may be completely missing.
(See the entry for trisoctahedron in
Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913.)