Thursday has one of the more widely known etymologies of the days. Throughout Middle and Old English, it took on various forms such as thuresday, thursdæg, thunresdæg, thurresdæg, and thunresdæg. However, though, this word in all of its forms can ultimately be broken down into its Old English components: thunre, the spelling of "Thor" at the time, and dæg, which we've already covered as meaning "day". In Proto-Germanic, thunre was thunraz, who was sort of a hybrid god of Thor and Jupiter (in most Romance languages, the fifth day of the week is normally named after Jupiter), similar to the Mercury/Odin split for old words for Wednesdays. It's weird. The literal meaning of thunraz was "thunder", and it retained this definition from its Proto-Indo-European progenitor, tenh. Dæg comes from Proto-Germanic dagaz, from PIE deg, or "to burn", as we've already covered in yesterday's post. So Thursday's hidden meaning is "burning thunder".
Hello! I'm Adam Aleksic. This year, I graduated from Harvard University with a degree in Government and Linguistics. There, I co-founded the Harvard Undergraduate Linguistics Society and wrote a thesis on Serbo-Croatian language policy, magna cum laude. In addition to etymology, I also really enjoy philosophy, trivia, vexillology, geography, board games, conlanging, art history, and law.