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From Proto-Indo-European *h₂erk-. Cognates include Latin arca (chest, box), arceō (I defend), arcānus (hidden, secret), arcera (kind of wagon), Old Armenian արգել (argel, obstacle) and Ancient Greek ἀρκέω (arkéō).



arx f (genitive arcis); third declension

  1. citadel, stronghold, fortress
    • Vergil, Aeneid, 2.56:
      ... Troiaque, nunc stares, Priamique arx alta, maneres.
      ... and Troy, you would now be standing, and Priam's mighty citadel still endure.
  2. height, summit, hilltop; the Capitoline hill
  3. defense, refuge
  4. (figuratively) bulwark


Third declension i-stem.

Case Singular Plural
nominative arx arcēs
genitive arcis arcium
dative arcī arcibus
accusative arcem arcēs
ablative arce arcibus
vocative arx arcēs


  • arx in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
  • arx in Charlton T. Lewis (1891) An Elementary Latin Dictionary, New York: Harper & Brothers
  • du Cange, Charles (1883), “arx”, in G. A. Louis Henschel, Pierre Carpentier, Léopold Favre, editors, Glossarium Mediæ et Infimæ Latinitatis (in Latin), Niort: L. Favre
  • arx in Gaffiot, Félix (1934) Dictionnaire Illustré Latin-Français [Illustrated Latin-French Dictionary], Hachette
  • arx in Harry Thurston Peck, editor (1898) Harper's Dictionary of Classical Antiquities, New York: Harper & Brothers
  • arx in Samuel Ball Platner (1929), Thomas Ashby, editor, A Topographical Dictionary of Ancient Rome, London: Oxford University Press
  • arx in William Smith et al., editor (1890) A Dictionary of Greek and Roman Antiquities, London: William Wayte. G. E. Marindin