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English definition of “octahedron”

octahedron

noun [C]     /ˌɒk.təˈhiː.drən/ US  /ˌɑːk-/ (plural octahedrons or octahedra   /-drə/   ) specialized
a solid shape whose eight sides are triangles of equal sizeGeometrical shapesSpherical, circular and annular objects
(Definition of octahedron noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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