a pleasant smell that frequently accompanies the first rain after a long period of warm, dry weather:other than the petrichor emanating from the rapidly drying grass, there was not a trace of evidence that it had rained at all
Origin:
1960s: blend of petro- 'relating to rocks' (the smell is believed to be caused by a liquid mixture of organic compounds which collects in the ground) and ichor
petrichor in other Oxford dictionaries
Definition of petrichor in the US English dictionary
