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Old English

Possibly from a contraction of þunresdæġ (Thursday, literally Thunor'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.