(Classical) IPA(key): /ˈfoe̯.dus/, [ˈfoe̯.dʊs]

Etymology 1Edit

From Proto-Indo-European *bʰeydʰ-. Cognate to Latin fidēs, Latin fīdus and Proto-Germanic *bīdaną.


foedus n ‎(genitive foederis); third declension

  1. treaty, agreement, contract
  2. league
  3. pact, compact

Third declension neuter.

Case Singular Plural
nominative foedus foedera
genitive foederis foederum
dative foederī foederibus
accusative foedus foedera
ablative foedere foederibus
vocative foedus foedera
Derived termsEdit

Etymology 2Edit

From Proto-Indo-European *bʰoyǝ- ‎(to frighten; be afraid). Compare Old English bǣdan ‎(to defile). More at bad.


foedus m ‎(feminine foeda, neuter foedum); first/second declension

  1. (physically) filthy, foul, disgusting, loathsome, ugly, unseemly, detestable, abominable, horrible
  2. (mentally) disgraceful, vile, obscene, base, dishonorable, shameful, infamous, foul

First/second declension.

Number Singular Plural
Case / Gender Masculine Feminine Neuter Masculine Feminine Neuter
nominative foedus foeda foedum foedī foedae foeda
genitive foedī foedae foedī foedōrum foedārum foedōrum
dative foedō foedō foedīs
accusative foedum foedam foedum foedōs foedās foeda
ablative foedō foedā foedō foedīs
vocative foede foeda foedum foedī foedae foeda
Derived termsEdit


  • foedus in Charlton T. Lewis & Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
  • foedus in Charlton T. Lewis (1891) An Elementary Latin Dictionary, New York: Harper & Brothers
  • FOEDUS in Charles du Fresne du Cange’s Glossarium Mediæ et Infimæ Latinitatis (augmented edition, 1883–1887)
  • foedus” in Félix Gaffiot (1934), Dictionnaire Illustré Latin-Français, Paris: Hachette.
  • Meissner, Carl; Auden, Henry William (1894) Latin Phrase-Book[1], London: Macmillan and Co.
    • to conclude a treaty, an alliance: foedus facere (cum aliquo), icere, ferire
    • to violate a treaty, terms of alliance: foedus frangere, rumpere, violare
    • (ambiguous) according to treaty: ex pacto, ex foedere
  • foedus in Harry Thurston Peck, editor (1898) Harper's Dictionary of Classical Antiquities, New York: Harper & Brothers
  • foedus in William Smith et al., editor (1890) A Dictionary of Greek and Roman Antiquities, London: William Wayte. G. E. Marindin