τετράεδρος

Ancient Greek

Etymology

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

Pronunciation

 

• IPA^(key): /te.trá.e.dros/ → /teˈtra.e.ðros/ → /teˈtra.e.ðros/

• (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

1. (geometry) having four faces, tetrahedral
2. (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
		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

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

Further reading

• τετράεδρον in Bailly, Anatole (1935) Le Grand Bailly: Dictionnaire grec-français, Paris: Hachette
• “τετράεδρος”, in ΛΟΓΕΙΟΝ [Logeion] Dictionaries for Ancient Greek and Latin (in English, French, Spanish, German, Dutch and Chinese), University of Chicago, since 2011
• “τετράεδρος”, in Liddell & Scott (1940) A Greek–English Lexicon, Oxford: Clarendon Press