Part four of the days of the week miniseries! This time, we investigate Thursday and Friday, or Thor's Day and Frigg's Day. Like the other days of the week discussed thus far, the names ‘Thursday’ and ‘Friday’ are loan translations of the Latin names for the days of the week.  

In Old English, the word for Wednesday was Wodnesdaeg, which literally meant ‘Woden's day.’ It comes from a loan translation of the Latin dies mercurii, which literally meant ‘day of Mercury’ (Woden was the Germanic god associated with the Roman god Mercury). This much is for certain. But how did the O in Wodnesdaeg shift to the E in ‘Wednesday?’