In geometry, a polychoron or 4-polytope is a four-dimensional polytope. It is a connected and closed figure, composed of lower-dimensional polytopal elements: vertices, edges, faces (polygons), and cells (polyhedra). Each face is shared by exactly two cells. The term polychoron (plural polychora), from the Greek roots poly (`many`) and choros (......
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http://en.wikipedia.org/wiki/Polychoron
An unofficial name (from the Greek poly meaning 'many' and choros meaning 'room' or 'space') for a four-dimensional polytope; it was first advocated by George Olshevsky.
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http://www.daviddarling.info/encyclopedia/P/polychoron.html
noun A four-dimensional shape; bounded by polyhedra. An example of a polytope.
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http://www.translationdirectory.com/glossaries/glossary141.htm
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