noun
a compound with a strong earthy flavor and aroma, often found in soil and water
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Geosmin is a compound responsible for the earthy smell in soil and water.
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I can always tell when it's going to rain because I can smell geosmin in the air.
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That pond smells like straight up geosmin, dude.
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The geosmin of nostalgia filled the room as she looked through old photographs.