ETYM Old Eng. wod, AS. wâd; akin to Dutch weede, German waid, Old High Germ. weit, Dan. vaid, veid, Swed. veide, Latin vitrum.
1. A blue dyestuff obtained from the woad plant.
2. Any of several herbs of the genus Isatis.
Broad-leafed plant yielding blue dye.
Biennial plant Isatis tinctoria, family Cruciferae, native to Europe, with arrow-shaped leaves and clusters of yellow flowers. It was formerly cultivated for a blue dye extracted from its leaves. Ancient Britons used the blue dye as a body paint in battle.