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A body or solid contained by many sides or planes.

hich, when viewed from a certain point, or as reflected from a curved mirror or through a polyhedron, appears regular and in proportion; a deformation of an image.

A solid bounded by twenty sides or faces. Regular icosahedron, one of the five regular polyhedrons, bounded by twenty equilateral triangules. Five triangules meet to form each solid angle of the polyhedron.

A solid having many summits or angular points; a polyhedron.

See Polyhedron.

r polygon (Geom.), a plane polygon which is both equilateral and equiangular. -- Regular polyhedron (Geom.), a polyhedron whose faces are equal regular polygons. There are five regular polyhedrons, -- the tetrahedron, the hexahedron, or cube, the octahedron, the dodecahedron, and the icosahedron. -- Regular sales (St…

., 4. -- Salient polygon (Geom.), a polygon all of whose angles are salient. -- Salient polyhedron (Geom.), a polyhedron all of whose solid angles are salient.