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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, sink, vat, wine-vat
    • 43 BCEc. 17 CE, Ovid, Fasti 3.558:
      inque cavōs ierant tertia musta lacūs
      and three times had the must been poured into the hollow wine-vats
      (The Latin word lacus, meaning ‘‘hollow’’ or ‘‘lake’’, also described a container used in ancient winemaking. See also mustum and must.)


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
  • Old French: lai
  • ? Old French: lac
    • Middle French: lac
      • Middle English: lac
      • French: lac
      • Norman: lac (Jersey)
  • Friulian: lâc
  • Galician: lago
  • Italian: lago
  • Ligurian: lâgo
  • Maltese: lag
  • Occitan: lac
  • Papiamentu: lago
  • Portuguese: lago
  • Romanian: lac
  • Romansch: lai
  • Sardinian: lagu
  • Sicilian: lacu
  • Spanish: lago
  • Venetian: łago


  • 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 with additions by D. P. Carpenterius, Adelungius and others, edited by Léopold Favre, 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