noun \ˌpä-lē-ˈhē-drən\
plural poly·he·drons or poly·he·dra\-drə\

Definition of POLYHEDRON

:  a solid formed by plane faces
poly·he·dral \-drəl\ adjective

Illustration of POLYHEDRON


New Latin
First Known Use: 1570


noun    (Concise Encyclopedia)

In Euclidean geometry, a three-dimensional object composed of a finite number of polygonal surfaces (faces). Technically, a polyhedron is the boundary between the interior and exterior of a solid. In general, polyhedrons are named according to number of faces. A tetrahedron has four faces, a pentahedron five, and so on; a cube is a six-sided regular polyhedron (hexahedron) whose faces are squares. The faces meet at line segments called edges, which meet at points called vertices. See also Platonic solid; Euler's formula.


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