This is my favourite word in the English language. It is not often that a scent is not an adjective, rather a noun. It comes from the Greek petros (for stone), and ichor. Ichor is the fluid that flows through the veins of the Gods & Goddesses in Greek Mythology. The organic oil that produces the smell petrichor is yellow, like the Gods' golden ichor. Petrichor to me, also exudes a sense of relief, of having finally receive confirmation of first rain after a curse of dryness. Pet - tree - ker. Petrichor.
My friend Tom says only a nerd would choose an obscure word like petrichor. But hear me out, if you used a word too often, it loses its luster, no? Petrichor is the kind of word that just sits around and waits for a specific magical moment to happen. Then BAM, petrichor happens, and you find yourself grinning for being in the right place, at the right time, and with the right word.