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/əˌpiːɹɵˈhiːdɹən/ · noun
(mathematics, geometry) A polyhedron with an infinite number of faces..
Coordinate term: zerohedron
There are exactly 12 regular apeirohedra that in some sense are reducible and have components that are regular figures of dimensions 1 and 2. These apeirohedra are blends of a planar regular apeirohedron, and a line segment { } or linear apeirogon {∞}. This explains why there are 12 = 6·2 blended (or non-pure) apeirohedra. For example, the blend of the standard square tessellation {4,4} and the infinite apeirogon {∞}, denoted {4,4}#{∞}, is an apeirohedron whose faces are helical apeirogons (over squares), rising above the squares of {4,4}, such that 4 meet at each vertex; the orthogonal projections of {4,4}#{∞} onto their component subspaces recover the original components, the square tessellation and the linear apeirogon.
Use apeirohedron when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Apeirohedron means (mathematics, geometry) A polyhedron with an infinite number of faces..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Coordinate term: zerohedron
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