tetrahedron

T1E1T1R1A1H4E1D2R1O1N1
/ˌtɛtɹəˈhiːdɹən/US, uncommon/ˌtɛ.tɹəˈhi.dɹɑn/

noun

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

OriginAncient Greek τετράεδρον →
Less commonScrabble 15
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Meanings

nountetrahedron (plural tetrahedra or tetrahedrons)

plural tetrahedra · plural tetrahedrons · alternative obsolete tetraedrum

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

Synonyms & antonyms

Also see
triangular pyramid

Origin

  1. Ancient Greekτετράεδρον“triangle-based pyramid”
  2. Englishtetrahedron

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

More words from Ancient Greek

Full word history & related roots →

Translations

Bulgarian тетраедър
  • тетраедър (tetraedăr)polyhedron
Catalan tetràedre, tetraedre
  • tetràedrepolyhedron
  • tetraedrepolyhedron
Chinese Mandarin 四面體 /四面体
  • 四面體 /四面体 (sìmiàntǐ)polyhedron
Czech čtyřstěn, tetraedr
  • čtyřstěnpolyhedron
  • tetraedrpolyhedron
Danish tetraeder
  • tetraederpolyhedron
Dutch viervlak, tetraëder
  • viervlakpolyhedron
  • tetraëderpolyhedron
Esperanto kvaredro
  • kvaredropolyhedron
Finnish tetraedri, nelitahokas
  • tetraedripolyhedron
  • nelitahokaspolyhedron
French tétraèdre
  • tétraèdrepolyhedron
German Tetraeder, Vierflächner
  • Tetraederpolyhedron
  • Vierflächnerpolyhedron
  • 4-Flächnerpolyhedron
Greek τετράεδρο
  • τετράεδρο (tetráedro)polyhedron
Hebrew ארבעון
  • ארבעון (arba'ón)polyhedron
Hindi चतुष्फलक
  • चतुष्फलक (catuṣphalak)polyhedron
Hungarian tetraéder
  • tetraéderpolyhedron
Icelandic ferflötungur, fjórflötungur
  • ferflötungurpolyhedron
  • fjórflötungurpolyhedron
Indonesian tetrahedron
  • tetrahedronpolyhedron
Italian tetraedro
  • tetraedropolyhedron
Japanese 四面体, 三角錐
  • 四面体 (shimentai)polyhedron
  • 三角錐 (sankakusui)polyhedron
  • 正四面体 (seishimentai)regular tetrahedron
Korean 사면체, 정사면체
  • 사면체 (samyeonche)polyhedron
  • 정사면체 (jeongsamyeonche)regular tetrahedron
Norwegian tetraeder
  • tetraederpolyhedron
Persian چهاروجهی
  • چهاروجهیpolyhedron
Polish czworościan
  • czworościanpolyhedron
Portuguese tetraedro
  • tetraedropolyhedron
Romanian tetraedru
  • tetraedrupolyhedron
Russian тетра́эдр, четырёхгра́нник
  • тетра́эдр (tetráedr)polyhedron
  • четырёхгра́нник (četyrjoxgránnik)polyhedron
Slovak štvorsten, tetraéder
  • štvorstenpolyhedron
  • tetraéderpolyhedron
Spanish tetraedro
  • tetraedropolyhedron
Swedish tetraeder
  • tetraederpolyhedron
Tagalog patdayag
  • patdayagpolyhedron
Ukrainian тетра́едр, чотиригра́нник
  • тетра́едр (tetráedr)polyhedron
  • чотиригра́нник (čotyryhránnyk)polyhedron
Vietnamese tứ diện
  • tứ diệnpolyhedron

Rhymes & wordplay

Rhymes with tetrahedron

polyhedronpentahedronrhombicosidodecahedronzerohedron
All rhymes →
Cite this entry
APA

tetrahedron. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/tetrahedron

MLA

“tetrahedron.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/tetrahedron. Accessed November 4, 2026.

Chicago

WatkinsX Dictionary, s.v. “tetrahedron,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/tetrahedron.

Source: tetrahedron on Wiktionary, CC BY-SA 4.0.