ˌtaksəˈfōlə̇n noun
Etymology: New Latin taxifolia (specific epithet of Pseudotsuga taxifolia, from tax- + -folia, from Latin folium leaf) + English -in — more at blade
: a crystalline pentahydroxy flavanone C 15 H 7 O 2 (OH) 5 that occurs naturally especially in the heartwood of Douglas fir, may be prepared from quercetin by reduction with sodium hydrosulfite, and yields quercetin on oxidation; dihydro-quercetin