dies Mercurii

From diēs (“day”) and Mercuriī, genitive of Mercurius (“Mercury”). Latin calque of Ancient Greek ἡμέρα (hēméra, “day”) Ἑρμοῦ (Hermoû) ("of Hermes"). The association of the seven week days with the seven classical planets is first attested in the Anthologiarum by Vettius Valens, ca. AD 170 and was known to Cassius Dio by the early 3rd century.

• (Classical) IPA^(key): /ˈdi.eːs merˈku.ri.iː/, [ˈd̪ieːs̠ mɛrˈkʊriː]
• (Ecclesiastical) IPA^(key): /ˈdi.es merˈku.ri.i/, [ˈd̪iːes merˈkuːriː]

diēs Mercuriī f (genitive diēī Mercuriī); fifth declension

1. Wednesday

Fifth-declension noun with an indeclinable portion.

• diēs hebdomadis
• diēs Dominica, diēs Dominicus, diēs Sōlis
• diēs Lūnae
• diēs Mārtis
• diēs Iovis
• diēs Veneris
• diēs Sabbatī, diēs Saturnī

• Corsican: marcuri
• Eastern Romance:
  • Aromanian: njercuri
  • Romanian: miercuri
• Emilian: mercordé
• Extremaduran: miércolis
• Franco-Provençal: mécredi, dimécro
• Italian: mercoledì
• Lombard: mercoldé
• Navarro-Aragonese:
  • Aragonese: miércols
• Neapolitan: miercurì

  Tarantino: mercrudìe

• Old French: mercredi
  • Champenois: mécurdi, mécueurdi, mieurdi
  • French: mercredi
    • Haitian Creole: mèkredi
    • Louisiana Creole: mékrédi, mèkrèdi, mærkrédi
  • Norman: Mêcrédi, mercrédi, méquerdi, Mekrëdi, mekrëdi
  • Walloon: mierkidi, dimiek
• Old Leonese:
  • Asturian: miércoles
• Old Occitan:
  • Catalan: dimecres
  • Occitan: dimècres
• Old Galician-Portuguese: mercores
  • Galician: mércores
• Old Spanish:
  • Ladino: mierkoles
  • Spanish: miércoles (see there for further descendants)
• Rhaeto-Romance:
  • Friulian: miercus, miercui
  • Ladin: mercol
  • Romansch: marculdi, marcurdi
• Sardinian: mélcuris, mércuis, mérculis, mércuris, mèrcuris
• Sicilian: mèrcuri, mièrcuri
• Venetian: mèrcore, mercoe, mercoli
• → Albanian: e mërkurë
• → Breton: dimerc’her
• → Cornish: de Merher
• → Proto-West Germanic: *Wōdanas dag (calque) (see there for further descendants)
• → Welsh: dydd Mercher (calque)