Standard Lemma guide

tetrahedron

noun · 2 senses · updated from the 2026-07-25 local source snapshot

Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.

Sound

Pronunciation

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  • tĕtrəhē'drən
  • /ˌtɛtɹəˈhiːdɹən/
  • US: Recorded audio is listed in the source snapshot.
  • UK: Recorded audio is listed in the source snapshot.
  • rhymes with -iːdɹən
  • CMU ARPABET: T EH2 T R AH0 HH IY1 D R AH0 N Digits mark lexical stress: 1 primary, 2 secondary, 0 unstressed.

1

noun

Meaning 1

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

Definition source: English Wiktionary via Wiktextract

Topics: geometry, mathematics, sciences

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

2

noun

Meaning 2

any polyhedron having four plane faces

Definition source: Princeton WordNet 3.0

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

Broader terms: polyhedron

History

Etymology

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

Across languages

Translations

48 source translations are retained for this English entry.

  • Belarusian: тэтра́эдр (tetráedr) — polyhedron
  • Belarusian: чатырохсце́ннік (čatyroxscjénnik) — polyhedron
  • Belarusian: чатырохсце́н (čatyroxscjén) — polyhedron
  • Bulgarian: тетраедър (tetraedǎr) — polyhedron
  • Catalan: tetràedre — polyhedron
  • Catalan: tetraedre — polyhedron
  • Chinese Mandarin: 四面體 /四面体 (sìmiàntǐ) — polyhedron
  • Czech: čtyřstěn — polyhedron
  • Czech: tetraedr — polyhedron
  • Danish: tetraeder — polyhedron
  • Dutch: viervlak — polyhedron
  • Dutch: tetraëder — polyhedron
  • Esperanto: kvaredro — polyhedron
  • Finnish: tetraedri — polyhedron
  • Finnish: nelitahokas — polyhedron
  • French: tétraèdre — polyhedron
  • German: Tetraeder — polyhedron
  • German: Vierflächner — polyhedron
  • German: 4-Flächner — polyhedron
  • Greek: τετράεδρο (tetráedro) — polyhedron
  • Hebrew: ארבעון (arba'ón) — polyhedron
  • Hindi: चतुष्फलक (catuṣphalak) — polyhedron
  • Hungarian: tetraéder — polyhedron
  • Icelandic: ferflötungur — polyhedron
  • Icelandic: fjórflötungur — polyhedron
  • Indonesian: tetrahedron — polyhedron
  • Italian: tetraedro — polyhedron
  • Japanese: 四面体 (shimentai) — polyhedron
  • Japanese: 三角錐 (sankakusui) — polyhedron
  • Korean: 사면체 (samyeonche) — polyhedron
  • Norwegian: tetraeder — polyhedron
  • Persian: چهاروجهی — polyhedron
  • Polish: czworościan — polyhedron
  • Portuguese: tetraedro — polyhedron
  • Romanian: tetraedru — polyhedron
  • Russian: тетра́эдр (tetráedr) — polyhedron
  • Russian: четырёхгра́нник (četyrjoxgránnik) — polyhedron
  • Slovak: štvorsten — polyhedron
  • Slovak: tetraéder — polyhedron
  • Spanish: tetraedro — polyhedron
  • Swedish: tetraeder — polyhedron
  • Tagalog: patdayag — polyhedron
  • Ukrainian: тетра́едр (tetráedr) — polyhedron
  • Ukrainian: чотиригра́нник (čotyryhránnyk) — polyhedron
  • Vietnamese: tứ diện — polyhedron
  • Vurës: wanagvet — polyhedron
  • Japanese: 正四面体 (seishimentai) — regular tetrahedron
  • Korean: 정사면체 (jeongsamyeonche) — regular tetrahedron
Real reading context

tetrahedron in complete knowledge articles