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A rotating tetrahedron

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Etymology edit

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

Pronunciation edit

  • enPR: tĕtrəhē'drən, IPA(key): /tɛtɹəˈhiːdɹən/
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Noun edit

tetrahedron (plural tetrahedrons or tetrahedra)

  1. (geometry) A polyhedron with four faces; the regular tetrahedron, the faces of which are equal equilateral triangles, is one of the Platonic solids.

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