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 & Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
  • arx in Charlton T. Lewis (1891) An Elementary Latin Dictionary, New York: Harper & Brothers
  • ARX in Charles du Fresne du Cange’s Glossarium Mediæ et Infimæ Latinitatis (augmented edition, 1883–1887)
  • arx” in Félix Gaffiot (1934), Dictionnaire Illustré Latin-Français, Paris: 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