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Definition of Petrichor :
\ ˈpe-trə-ˌkȯr \ noun, a pleasant smell that frequently accompanies the first rain after a long period of warm, dry weather.
"As Bang Chow The Panda was able to smell the petrichor from his confines at the Garden City Zoo, he knew the rabbit revolution was coming."
See also: https://brenthollister.blogspot.com/