TETRAHEDRON

tetrahedron

(noun) any polyhedron having four plane faces

Source: WordNet® 3.1

Etymology

Noun

tetrahedron (plural tetrahedrons or tetrahedra)

(geometry) A polyhedron with four faces; the regular tetrahedron, the faces of which are equal equilateral triangles, is one of the Platonic solids.

Source: Wiktionary

Tet`ra*he"dron, n. Etym: [Tetra- + Gr. (Geom.)

Definition: A solid figure inclosed or bounded by four triangles.

Note: In crystallography, the regular tetrahedron is regarded as the hemihedral form of the regular octahedron. Regular tetrahedron (Geom.), a solid bounded by four equal equilateral triangles; one of the five regular solids.

Source: Webster’s Unabridged Dictionary 1913 Edition

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