1) Four-dimensional geometry
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https://www.crosswordclues.com/clue/duocylinder
It is analogous to a cylinder in 3-space, which is the Cartesian product of a disk with a line segment. ==Geometry== ===Bounding 3-manifolds=== The duocylinder is so called because these two bounding 3-manifolds may be thought of as 3-dimensional cylinders `bent around` in 4-dimensional space such that they form closed loops in the XY and ZW pla.....
Found on
http://en.wikipedia.org/wiki/Duocylinder
[noun] A four-dimensional shape that can roll along two independent linear axes. If it is placed on one rolling axis, it cannot roll along the other axis, but it can roll no matter what side it is placed on. It can be formed by rotating the flat ends of a cylinder into four-dimensional space.
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http://www.translationdirectory.com/glossaries/glossary141.htm
No exact match found.
