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Possibly through Osco-Umbrian (as the expected Latin form would be *lundus), from Proto-Italic *lonðwos, from Proto-Indo-European *lendʰ- (to enter, penetrate, expand).[1] Cognate with Old English lynd (fat, grease), Old English lendenu (loins). More at lend.



lumbus m (genitive lumbī); second declension

  1. (anatomy) loin
  2. (in the plural) genitals


Second declension.

Case Singular Plural
nominative lumbus lumbī
genitive lumbī lumbōrum
dative lumbō lumbīs
accusative lumbum lumbōs
ablative lumbō lumbīs
vocative lumbe lumbī



  • lumbus in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
  • lumbus in Charlton T. Lewis (1891) An Elementary Latin Dictionary, New York: Harper & Brothers
  • du Cange, Charles (1883), “lumbus”, in G. A. Louis Henschel, Pierre Carpentier, Léopold Favre, editors, Glossarium Mediæ et Infimæ Latinitatis (in Latin), Niort: L. Favre
  • lumbus” in Félix Gaffiot’s Dictionnaire Illustré Latin-Français, Hachette (1934)
  • Andrew L. Sihler (1995) New Comparative Grammar of Greek and Latin, New York, Oxford, Oxford University Press
  1. ^ De Vaan, Michiel (2008) Etymological Dictionary of Latin and the other Italic Languages (Leiden Indo-European Etymological Dictionary Series; 7), Leiden, Boston: Brill, page 352