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/Ëpet.rÉª.kÉËr/ /Ëpet.rÉª.kÉËr/ specialized. âº the smell produced when rain falls on dry ground, usually experienced as being pleasant. (Definition of âpetrichorâ from the Cambridge Advanced Learner's Dictionary & Thesaurus Â© Cambridge University Press)
This past December, a team of scientists at MIT isolated the source of that fresh smell we sense after a satisfying rain. The scent called petrichor (petra, the Greek word for âstone,â and ichor, which means âthe blood of the gods,â) aerates when raindrops of a certain size and speed fall on porous earth, burst, and release chemical compounds from the ground into the air.