tetrahedron
A polyhedron with four facesA polyhedron with four faces; the regular tetrahedron, the faces of which are equal equilateral triangles, is one of the Platonic solids.
Meaning
1 sensesA polyhedron with four faces; the regular tetrahedron, the faces of which are equal equilateral triangles, is one of the Platonic solids.
Tetraeder, Vierflächner, 4-Flächner
тетра́эдрtetráedr, четырёхгра́нникčetyrjoxgránnik
тетра́едрtetráedr, чотиригра́нникčotyryhránnyk
any polyhedron having four plane faces
Translations
8 languagesBy meaning 1
By meaning 1
By meaning 1
Origin
From Ancient Greek τετράεδρον (tetráedron, “triangle-based pyramid”), from τετράεδρος (tetFrom Ancient Greek τετράεδρον (tetráedron, “triangle-based pyramid”), from τετράεδρος (tetráedros), from τετράς (tetrás, “four”) + ἕδρα (hédra, “seat”). By surface analysis, tetra- + -hedron.
Wiktionary, CC BY-SA 4.0 · source
Forms
plural: tetrahedra / tetrahedrons| Singular | tetrahedron |
|---|---|
| Plural | tetrahedra / tetrahedrons |
regular
Word family
15 related wordsLessons for this word
1 lessons- A1Plural nouns — Because its plural is irregular
See also
neighbours in the dictionaryDictionary text adapted from Wiktionary (Wiktionary contributors, CC BY-SA 4.0) and Open English WordNet / Princeton WordNet (CC BY 4.0, WordNet License); shared under CC BY-SA 4.0. Example sentences and recordings are credited where they appear.