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Tetrahedron

//ˌtɛtɹəˈhiːdɹən// noun

Definitions

Noun
  1. 1
    A polyhedron with four faces; the regular tetrahedron, the faces of which are equal equilateral triangles, is one of the Platonic solids.
  2. 2
    any polyhedron having four plane faces wordnet

Etymology

From Ancient Greek τετράεδρον (tetráedron, “triangle-based pyramid”), from τετράεδρος (tetráedros), from τετράς (tetrás, “four”) + ἕδρα (hédra, “seat”). By surface analysis, tetra- + -hedron.

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