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By surface analysis, avus +‎ -unculus. Actually from an n-stem noun suffixed with -culus, from Proto-Indo-European *h₂ewh₂-on-, whence also Proto-Celtic *awontīr (uncle)[1][2] and possibly Proto-Germanic *awô (grandfather), from *h₂éwh₂os (older male relative), whence also avus (grandfather).



avunculus m (genitive avunculī); second declension

  1. maternal uncle, mother's brother
  2. mother's sister's husband
  3. great-uncle


Second-declension noun.

Case Singular Plural
Nominative avunculus avunculī
Genitive avunculī avunculōrum
Dative avunculō avunculīs
Accusative avunculum avunculōs
Ablative avunculō avunculīs
Vocative avuncule avunculī


See also[edit]


  1. ^ Matasović, Ranko (2009) Etymological Dictionary of Proto-Celtic (Leiden Indo-European Etymological Dictionary Series; 9), Leiden: Brill, →ISBN, page 48
  2. ^ De Vaan, Michiel (2008), “avus”, in Etymological Dictionary of Latin and the other Italic Languages (Leiden Indo-European Etymological Dictionary Series; 7), Leiden, Boston: Brill, →ISBN, page 66

Further reading[edit]

  • avunculus”, in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
  • avunculus”, in Charlton T. Lewis (1891) An Elementary Latin Dictionary, New York: Harper & Brothers
  • avunculus 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)
  • avunculus in Gaffiot, Félix (1934) Dictionnaire illustré latin-français, Hachette.