Illustration of octahedron
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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
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
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
Time Traveler
The first known use of octahedron was in 1570 👨🏻🏫 Mr. Ng 韋氏詞典 📚 – mw.mister5️⃣.net
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