woad

woad
[wəʊd]
noun
  1. [mass noun]a yellow-flowered European plant of the cabbage family. It was formerly widely grown in Britain as a source of blue dye, which was extracted from the leaves after they had been dried, powdered, and fermented
    菘蓝属植物,欧洲菘蓝
  2. Isatis tinctoria, family Cruciferae
    拉丁名Isatis tinctoria,十字花科
    ■the dye obtained from this plant, now superseded by synthetic products
    靛蓝
语源
  1. Old English wād, of Germanic origin; related to Dutch wede and German Waid
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