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See also: lāčus



From Proto-Italic *lakus, from Proto-Indo-European *lókus (lake, pool). Cognate with Ancient Greek λάκκος (lákkos, cistern, tank, pit) and Old English lagu (sea, ocean, flood). More at lay.



lacus m (genitive lacūs); fourth declension

  1. a lake, pond, basin; reservoir
  2. a tank, tub, vat, sink


Fourth-declension noun (dative/ablative plural in -ubus).

Case Singular Plural
Nominative lacus lacūs
Genitive lacūs lacuum
Dative lacuī lacubus
Accusative lacum lacūs
Ablative lacū lacubus
Vocative lacus lacūs


Derived terms[edit]


  • Aragonese: laco
  • Aromanian: lac
  • Asturian: llagu
  • Kabuverdianu: lagu
  • Catalan: llac
  • Dalmatian: lac
  • Emilian: lèg
  • Esperanto: lago
  • French: lac
  • Friulian: lâc
  • Galician: lago
  • Italian: lago


  • lacus in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
  • lacus in Charlton T. Lewis (1891) An Elementary Latin Dictionary, New York: Harper & Brothers
  • lacus in Charles du Fresne du Cange’s Glossarium Mediæ et Infimæ Latinitatis (augmented edition, 1883–1887)
  • lacus in Gaffiot, Félix (1934) Dictionnaire illustré Latin-Français, Hachette
  • lacus in Harry Thurston Peck, editor (1898) Harper's Dictionary of Classical Antiquities, New York: Harper & Brothers
  • lacus in William Smith et al., editor (1890) A Dictionary of Greek and Roman Antiquities, London: William Wayte. G. E. Marindin