Etymologically

Etymology and origin of the Latin word Dacus

Confidence
Uncertain
First attested
c. 50 BC Caesar, in the plural More words from the 1st century BC
Ultimate origin
Latin Dacia,-us

Pronunciation

  • Classical: [ˈdaː.kʊs][1]
  • Ecclesiastical: [ˈdaː.kus][1]

Forms

Dācus m (genitive Dācī, feminine Dāca); second declension[1]

Etymology

The origin is uncertain.[2] Wiktionary takes it as formed from Latin Dācia + -us, from the name of the country.[1] Georges instead treats ⟨Dācia⟩ as formed from the people's name, the plural ⟨Dācī⟩.[3] Köbler calls the name of unclear origin, perhaps Thracian.[2]

Ancient writers explained it differently: Isidore of Seville held that the Dacians were offspring of the Goths and that their name stood for ⟨Dagi⟩, because they came of Gothic stock.[4][5]

Earliest recorded meaning

Caesar uses the plural Dācī for the Dacians, a warlike people related to the Getae,[3][6][2] and Virgil has the singular Dācus as a collective for the people.[3][6]

Semantic evolution

In Classical Latin the word is both a noun, usually in the plural, for an inhabitant of Dācia, and an adjective, “Dacian”.[7][8] The singular is often collective in the poets,[3] and a feminine Dāca is found in Venantius Fortunatus and in an inscription.[3]

In medieval Britain the name was transferred to the Danes: Domesday Book names men called Dacus, and chroniclers use the plural for the Danish invaders.[9][2] From this came an adjective “Danish” and, used as a noun, a name for the Danish axe or pole-axe.[9][2] A medieval Hungarian source has dacus for a kind of short sword.[10]

Timeline

  • c. 50 BC – Caesar names the Dacians, in the plural Dācī.[3][2]
  • 70–19 BC – Virgil uses the singular Dācus for the people in the Georgics.[3][6][2]
  • c. 45–96 AD – Statius uses it as an adjective, “Dacian”.[6][2]
  • c. 560–636 AD – Isidore of Seville connects the Dacians with the Goths.[4][2]
  • 1086 – Domesday Book uses it for a Dane.[9][2]
  • 1461 – A medieval text uses it as an adjective, “Danish”.[2]

Meanings

Noun

  1. A Dacian, an inhabitant of Dacia; usually in the plural, the Dacians.[7][3][8]
  2. (Medieval Latin) A Dane.[9][2]
  3. (Medieval Latin) A Danish axe, a pole-axe.[9]
  4. (Medieval Latin) A short sword.[10]

Adjective

  1. Dacian, of Dacia or the Dacians.[7][6][11]
  2. (Medieval Latin) Danish.[9][2]
  • Dācia

References

  1. ^ a b c d Wiktionary, the free dictionary, https://en.wiktionary.org
  2. ^ a b c d e f g h i j k l m Köbler, Gerhard (2010), Lateinisches Abkunfts- und Wirkungswörterbuch für Altertum und Mittelalter, online ed., koeblergerhard.de
  3. ^ a b c d e f g h Georges, Karl Ernst (1913–1918), Ausführliches lateinisch-deutsches Handwörterbuch, 8th ed., ed. Heinrich Georges, Hannover; Leipzig: Hahn
  4. ^ a b Thesaurus linguae Latinae (1900–), Leipzig: Teubner; Berlin: De Gruyter; open-access ed., Munich: Bayerische Akademie der Wissenschaften
  5. ^ Isidore of Seville, Etymologiarum sive Originum libri XX, ed. W. M. Lindsay (Oxford, 1911).
  6. ^ a b c d e Gaffiot, Félix (2016), Dictionnaire latin-français, new ed. by Gérard Gréco et al. (Gaffiot 2016), online ed.
  7. ^ a b c Glare, P. G. W., ed. (2012), Oxford Latin Dictionary, 2nd ed., Oxford: Oxford University Press
  8. ^ a b Conte, Gian Biagio; Pianezzola, Emilio; Ranucci, Giuliano (2010), il Latino: Vocabolario della lingua latina, 3rd ed., Florence: Le Monnier
  9. ^ a b c d e f Latham, R. E., D. R. Howlett, R. K. Ashdowne, et al. (1975–2013), Dictionary of Medieval Latin from British Sources, London: British Academy / Oxford University Press
  10. ^ a b Bartal, Antal, et al. (1987–), Lexicon Latinitatis Medii Aevi Hungariae, Budapest: Akadémiai Kiadó; online ed. ELTE
  11. ^ VoLat: Vocabolario della Lingua Latina (2018), Milan: Hoepli
Cite this entry

“Dacus.” Etymologically, 13 Nov. 2026, etymologically.com/la/Dacus. Accessed 14 Nov. 2026.

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