Definitions
from The Century Dictionary.
- In mathematics, a four-dimensional body bounded by 5 tetrahedra.
Etymologies
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Examples
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Any five points, not all in one three-space, may be regarded as the vertices of a pentahedroid.
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The simplest case of a hyperpyramid is a figure called a pentahedroid.
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These five points, taken four at a time, give us five tetrahedrons and the pentahedroid may be taken in five different ways as a hyperpyramid.
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The pentahedroid is formed by turning these toward one another until they are brought completely together again.
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