διάμετρος

Ancient Greek

Etymology

From δῐᾰ- (dĭă-, “through”) +‎ μέτρον (métron, “measure”).

Pronunciation

 

• IPA^(key): /di.á.me.tros/ → /ðiˈa.me.tros/ → /ðiˈa.me.tros/

• (5^th BCE Attic) IPA^(key): /di.á.me.tros/
• (1^st CE Egyptian) IPA^(key): /diˈa.me.tros/
• (4^th CE Koine) IPA^(key): /ðiˈa.me.tros/
• (10^th CE Byzantine) IPA^(key): /ðiˈa.me.tros/
• (15^th CE Constantinopolitan) IPA^(key): /ðiˈa.me.tros/

Noun

δῐᾰ́μετρος • (dĭắmetros) f (genitive δῐᾰμέτρου); second declension

1. the diameter or diagonal of a parallelogram
   • 386 BCE – 367 BCE, Plato, Meno 85B
   • 360 BCE, Plato, Timaeus 54E
   • 384 BCE – 322 BCE, Aristotle, Nicomachean Ethics 5.5.8
   • 350 BCE, Aristotle, On the Heavens 1.8.11
   • 384 BCE – 322 BCE, Aristotle, Meteorology 2.6.5
   • 384 BCE – 322 BCE, Aristotle, Progression of Animals 1.5
   • 384 BCE – 322 BCE, Aristotle, Progression of Animals 14.4, (Compare Plutarch, Moralia 23A)
   • 125 CE – 200 CE, Lucian, The Downward Journey 14
   1. the diameter of a circle
      • 350 BCE, Aristotle, On the Heavens 1.4.3
      • 384 BCE – 322 BCE, Aristotle, Movement of Animals 3.4
2. a rule for drawing the diameter
   • 405 BCE, Aristophanes, The Frogs 801

Inflection

Second declension of ἡ δῐᾰ́μετρος; τῆς δῐᾰμέτρου (Attic)

Case / #	Singular	Dual	Plural
Nominative	ἡ δῐᾰ́μετρος hē dĭắmetros	τὼ δῐᾰμέτρω tṑ dĭămétrō	αἱ δῐᾰ́μετροι hai dĭắmetroi
Genitive	τῆς δῐᾰμέτρου tês dĭămétrou	τοῖν δῐᾰμέτροιν toîn dĭămétroin	τῶν δῐᾰμέτρων tôn dĭămétrōn
Dative	τῇ δῐᾰμέτρῳ têi dĭămétrōi	τοῖν δῐᾰμέτροιν toîn dĭămétroin	ταῖς δῐᾰμέτροις taîs dĭămétrois
Accusative	τὴν δῐᾰ́μετρον tḕn dĭắmetron	τὼ δῐᾰμέτρω tṑ dĭămétrō	τᾱ̀ς δῐᾰμέτρους tā̀s dĭămétrous
Vocative	δῐᾰ́μετρε dĭắmetre	δῐᾰμέτρω dĭămétrō	δῐᾰ́μετροι dĭắmetroi
Notes:	This table gives Attic inflectional endings. For declension in other dialects, see Appendix:Ancient Greek dialectal declension.

Descendants

• Danish: diameter
• Dutch: diameter
• English: diameter
• Spanish: diámetro
• Norwegian: diameter
• Russian: диаметр (diametr)
• Sanskrit: जामित्र (jāmitra)

References

• “διάμετρος”, in Liddell & Scott (1940) A Greek–English Lexicon, Oxford: Clarendon Press
• “διάμετρος”, in Liddell & Scott (1889) An Intermediate Greek–English Lexicon, New York: Harper & Brothers
• διάμετρος in Bailly, Anatole (1935) Le Grand Bailly: Dictionnaire grec-français, Paris: Hachette
• διάμετρος in the Diccionario Griego–Español en línea (2006–2025)
• Woodhouse, S. C. (1910) English–Greek Dictionary: A Vocabulary of the Attic Language‎^[1], London: Routledge & Kegan Paul Limited.
  • diagonal idem, page 221.
  • diameter idem, page 222.

Greek

Noun

διάμετρος • (diámetros) f (plural διάμετροι)

1. (geometry, engineering) diameter

Declension

Declension of διάμετρος

	singular	plural
nominative	διάμετρος (diámetros)	διάμετροι (diámetroi)
genitive	διαμέτρου (diamétrou)	διαμέτρων (diamétron)
accusative	διάμετρο (diámetro)	διαμέτρους (diamétrous)
vocative	διάμετρε (diámetre) διάμετρο (diámetro)	διάμετροι (diámetroi)

See also

• ακτίνα f (aktína, “radius”)
• περιφέρεια f (periféreia, “circumference”)