The quality or condition of being buttery; the richness, smoothness, or buttery flavor present in something.
From 'buttery' plus the abstract noun suffix '-ness,' creating a noun describing the state or quality of having buttery characteristics.
Food scientists can actually measure butteriness through specific volatile compounds like diacetyl, which gives butter its distinctive aroma—it's the most unmeasurable-seeming quality that's actually scientifically quantifiable!
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