octahedron : Idioms & Phrases
cubo-octahedron
Cu`bo-oc`ta*he"dron noun
Definitions
(Crystallog.) A combination of a cube and octahedron, esp. one in which the octahedral faces meet at the middle of the cubic edges.
Webster 1913
regular octahedron
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noun an octahedron with eight equilateral triangles as faces
