单词	octahedron
释义	octahedron noun oc·​ta·​he·​dron ˌäk-tə-ˈhē-drən  plural octahedrons or octahedra ˌäk-tə-ˈhē-drə  : a solid bounded by eight plane faces Illustration of octahedron Example Sentences Recent Examples on the Web They are defined by symmetry, and the Greeks knew that there were only five possibilities meeting the criteria: the tetrahedron, cube, octahedron, dodecahedron and icosahedron. Eugenia Cheng, WSJ, 10 Aug. 2017 Diamonds, which form eight-sided crystals called octahedrons, can be billions of years old, Dr. Harlow said. C. Claiborne Ray, New York Times, 12 June 2017 Word History Etymology Greek oktaedron, from okta- + -edron -hedron First Known Use 1570, in the meaning defined above
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