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In geometry, a parallelepiped is a three-dimensional figure formed by six parallelograms. (The term rhomboid is also sometimes used with this meaning.) By analogy, it relates to a parallelogram just as a cube relates to a square. In Euclidean geometry, its definition encompasses all four concepts (i.e., parallelepiped, parallelogram, cube, and square). In this context of affine geometry, in which angles are not differentiated, its definition admits only parallelograms and parallelepipeds. Three equivalent definitions of parallelepiped are
- a polyhedron with six faces (hexahedron), each of which is a parallelogram,
- a hexahedron with three pairs of parallel faces, and
- a prism of which the base is a parallelogram.
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1. a prism whose bases are parallelograms
(synonym) parallelepiped, parallelopiped, parallelepipedon
|Webster's Revised Unabridged Dictionary (1913)||Download this dictionary|
Webster's Revised Unabridged Dictionary (1913), edited by Noah Porter. About
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