quercetin

1. (organic chemistry, biochemistry) A flavonol found in many fruits, vegetables, leaves and grains.Examples: "Quercetin has gained the attention of the supplement industry, and is now widely promoted as a natural anti-inflammatory and antioxidant magic bullet."; "The one daily supplement that often reduces allergic symptoms across the board is the phytonutrient quercetin, a chemical compound known as a bioflavonoid and found in plants."; "In plasma, quercetin mostly exists as glucuronated, sulfated, and/or methylated quercetin conjugates."countableuncountable