τετράεδρος

Ancient Greek

Etymology

From τετρα- (tetra-, “four”) +‎ ἕδρᾱ (hédrā, “face of a solid”) +‎ -ος (-os).

Pronunciation

(5^th BCE Attic) IPA^(key): /te.trá.e.dros/
(1^st CE Egyptian) IPA^(key): /teˈtra.e.dros/
(4^th CE Koine) IPA^(key): /teˈtra.e.ðros/
(10^th CE Byzantine) IPA^(key): /teˈtra.e.ðros/
(15^th CE Constantinopolitan) IPA^(key): /teˈtra.e.ðros/

Adjective

τετράεδρος • (tetráedros) m or f (neuter τετράεδρον); second declension

(geometry) having four faces, tetrahedral
(nominalized, neuter, geometry) tetrahedron

Declension

Second declension of τετρᾰ́εδρος; τετρᾰ́εδρον (Attic)

Number	Singular		Dual		Plural
Case/Gender	Masculine / Feminine	Neuter	Masculine / Feminine	Neuter	Masculine / Feminine	Neuter
Nominative	τετρᾰ́εδρος tetrắedros	τετρᾰ́εδρον tetrắedron	τετρᾰέδρω tetrăédrō	τετρᾰέδρω tetrăédrō	τετρᾰ́εδροι tetrắedroi	τετρᾰ́εδρᾰ tetrắedră
Genitive	τετρᾰέδρου tetrăédrou	τετρᾰέδρου tetrăédrou	τετρᾰέδροιν tetrăédroin	τετρᾰέδροιν tetrăédroin	τετρᾰέδρων tetrăédrōn	τετρᾰέδρων tetrăédrōn
Dative	τετρᾰέδρῳ tetrăédrōi	τετρᾰέδρῳ tetrăédrōi	τετρᾰέδροιν tetrăédroin	τετρᾰέδροιν tetrăédroin	τετρᾰέδροις tetrăédrois	τετρᾰέδροις tetrăédrois
Accusative	τετρᾰ́εδρον tetrắedron	τετρᾰ́εδρον tetrắedron	τετρᾰέδρω tetrăédrō	τετρᾰέδρω tetrăédrō	τετρᾰέδρους tetrăédrous	τετρᾰ́εδρᾰ tetrắedră
Vocative	τετρᾰ́εδρε tetrắedre	τετρᾰ́εδρον tetrắedron	τετρᾰέδρω tetrăédrō	τετρᾰέδρω tetrăédrō	τετρᾰ́εδροι tetrắedroi	τετρᾰ́εδρᾰ tetrắedră
Derived forms	Adverb		Comparative		Superlative
Derived forms	τετρᾰέδρως tetrăédrōs		τετρᾰεδρότερος tetrăedróteros		τετρᾰεδρότᾰτος tetrăedrótătos
Notes:	This table gives Attic inflectional endings. For declension in other dialects, see Appendix:Ancient Greek dialectal declension.

Descendants

→ Danish: tetraeder
→ Dutch: tetraëder
→ English: tetrahedron
→ Finnish: tetraedri
→ French: tétraèdre
→ Galician: tetraedro
→ German: Tetraeder
→ Hungarian: tetraéder
→ Italian: tetraedro
→ Norwegian Bokmål: tetraeder
→ Norwegian Nynorsk: tetraeder
→ Portuguese: tetraedro
→ Russian: четырёхгранник (četyrjóxgrannik) (calque)
→ Spanish: tetraedro
→ Swedish: tetraeder