þursdæġ m
Possibly from a contraction of þunresdæġ (“Thursday”, literally “Thor's day”), but more likely from Old Norse þōrsdagr or Old Danish þūrsdag (“Thursday”) (compare modern torsdag); all from Proto-Germanic *Þunras dagaz (“Thor's day”), a calque of Latin dies Iovis, equivalent to Old English þunres (“genitive of the god's name Þunor”) + dæġ (“day”). More at thunder, day.