tetrahedron

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English[edit]

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A rotating tetrahedron

Etymology[edit]

From Ancient Greek τετράεδρόν ‎(tetráedrón, triangle-based pyramid), from τετράεδρός ‎(tetráedrós), from τετράς ‎(tetrás, four) + ἕδρα ‎(hédra, seat); synchronically analyzable as tetra- +‎ -hedron.

Pronunciation[edit]

  • enPR: tĕtrəhē'drən, IPA(key): /tɛtrəˈhiːdrən/

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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Translations[edit]