also called Dyerswoad (Isatis tinctoria), biennial or perennial herb, of the mustard family (Brassicaceae), formerly grown as a source of the blue dye indigo and now sometimes cultivated for its clusters of small, four-petalled yellow flowers. It is a summer-flowering native of Eurasia, now naturalized in southeastern North America. Woad reaches 90 centimetres (3 feet) and produces clusters of dangling, winged, oval, single-seeded fruits. The hairy stem leaves have arrow-shaped bases; the long basal leaves are downy and lance shaped. The ground and dried leaves, when wetted and fermented, produce indigo.
WOAD
Meaning of WOAD in English
Britannica English vocabulary. Английский словарь Британика. 2012