- The distinctive smell given off by earth, rock, or pavement at the beginning of a rain after a period of warm, dry weather.
- The organic compounds that produce such a smell.
Origin of petrichorpetr- ichor ( coined in 1964 by Isabel Joy Bear and Richard Grenfell Thomas, Australian geochemists )
From petr(o)- + ichor. The term was coined by two Australian researchers in 1964 for an article in the journal Nature.