quercetin /kwûrˈsə-tin/ noun

A bioflavonoid with antioxidant and antihistamine properties found in bracken and many foods incl tea, red wine and some vegetables, thought to provide some protection against heart disease

quercetum /kwûr-sēˈtəm/ noun

A collection of oak trees

querˈcitron /-si-trən/ noun

1. A N American oak, the dyer's oak or yellow-barked oak
2. Its inner bark, a source of quercetin and flavin