From Old Norse þórsdagr (“Thor's day, day of Thor”) Þórr (“Thor”) (modern Icelandic Þór) and dagr (“a day”) (modern Icelandic dagur (“a day”)). Corresponds to late Proto-Germanic *Þunras dagaz (“day of Thor”), calque of Latin dies Iovis.
- This word was replaced during Iceland’s shift to Christianity by fimmtudagur, which means simply “fifth day”. It is now considered archaic, but may be used jocularly or by some revivalists.
declension of þórsdagur