tetrahedron

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English

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A rotating tetrahedron

Alternative forms

Etymology

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

Pronunciation

  • enPR: tĕtrəhē'drən, IPA(key): /ˌtɛtɹəˈhiːdɹən/
  • Audio (US):(file)
  • Audio (UK):(file)
  • Rhymes: -iːdɹən

Noun

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.

Derived terms

Translations

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