dyer's woad


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Noun1.dyer's woad - European biennial formerly grown for the blue coloring matter yielded by its leavesdyer's woad - European biennial formerly grown for the blue coloring matter yielded by its leaves
genus Isatis, Isatis - Old World genus of annual to perennial herbs: woad
woad - any of several herbs of the genus Isatis
References in classic literature ?
For the few miles of country road that I persuaded our people to make, another would succeed in constructing a canal or a highway; and for my encouragement of the peasants' trade in hats, a minister would emancipate France from the industrial yoke of the foreigner by encouraging the manufacture of clocks in different places, by helping to bring to perfection our iron and steel, our tools and appliances, or by bringing silk or dyer's woad into cultivation.
She envisions plants capable of producing a spectrum of colors, including gypsywort (which makes black dye on wool and silk), wild mustard (yellow), double-flowered yellow flag iris (blackish green), bedstraw (red dye from roots, yellow from flowers), dyer's woad (blue), Japanese indigo (blue) madder root (red), and marigold (yellows and oranges).
Seeds from dyer's woad secrete a toxin that inhibits the growth of other vegetation.