1911 Encyclopædia Britannica/Octahedron |←Ocriculum||1911
Encyclopædia Britannica, Volume 19 |See also Octahedron on
Wikipedia, and our 1911 Encyclopædia Britannica disclaimer.|
OCTAHEDRON (Gr. ὀκτώ, eight, ἕδρα, base), a solid bounded by
eight triangular faces; it has 6 vertices and 12 edges. The
regular octahedron has for its faces equilateral triangles; it
is the reciprocal of the cube. Octahedra having triangular faces
other than equilateral occur as crystal forms. See Polyhedron
and Crystallography.