Adjacent Words

polyhedron definitions

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WordNet (r) 3.0 (2005)

n
1: a solid figure bounded by plane polygons or faces

Merriam Webster's

noun (plural -drons or polyhedra) Etymology: New Latin Date: 1570 a solid formed by plane faces • polyhedral adjective

Britannica Concise

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 Euler's formula.

Oxford Reference Dictionary

n. (pl. polyhedra) a solid figure with many (usu. more than six) faces. Derivatives: polyhedral adj. polyhedric adj. Etymology: Gk poluedron neut. of poluedros (as POLY-(1), hedra base)

Webster's 1913 Dictionary

Polyhedron Pol`y*he"dron, n.; pl. E. Polyhedrons., L. Polyhedra. [NL., fr. Gr. ? with many seats or sides; poly`s many + ? a seat or side: cf. F. poly[`e]dre.] 1. (Geom.) A body or solid contained by many sides or planes. 2. (Opt.) A polyscope, or multiplying glass.