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tetrahedron

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noun, tet·ra·he·dron \ˌte-trə-ˈhē-drən\

Definition of tetrahedron

plural tetrahedrons or tetrahedraplay \-drə\

  1. :  a polyhedron that has four faces



Illustration of tetrahedron

Origin of tetrahedron

New Latin, from Late Greek tetraedron, neuter of tetraedros having four faces, from Greek tetra- + hedra seat, face — more at sit


First Known Use: 1570


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