tris·oc·ta·he·dron | \ ˌtri-ˌsäk-tə-ˈhē-drən 
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\Definition of trisoctahedron
: a solid (such as a crystal) having 24 congruent faces meeting on the edges of a regular octahedron
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Time Traveler for trisoctahedron
The first known use of trisoctahedron was circa 1847
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