Petrichor is a pleasant word for a pleasant thing: the earthy aroma of rain on soil. The term was coined in a 1964 Nature article by Australian scientist Richard Thomas, who had studied the phenomenon for years. He derived the word from Ancient Greek petra, meaning "rock", and ichor, which was the mythological blood of the gods (the idea was that petrichor is the "essence" of stone, like ichor is the essence of the gods). Before the Nature article, people just referred to petrichor as "argillaceous odour". It was also previously described in Uttar Pradesh, India, as matti ka attar, or "earth perfume", which I think is a way cooler name. Both petra and ichor are of unknown, possibly Pre-Greek origin. Usage of the term peaked in 1975, decreased until 1995, and has been repopularized since.
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.