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Definition of woad:

  1. A blue dyestuff, or coloring matter, consisting of the powdered and fermented leaves of the Isatis tinctoria. It is now superseded by indigo, but is somewhat used with indigo as a ferment in dyeing.
  2. An herbaceous cruciferous plant ( Isatis tinctoria). It was formerly cultivated for the blue coloring matter derived from its leaves.

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