GNU Collaborative International Dictionary of English

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1.       
   Woad , n. [OE. wod, AS. wād; akin to D. weede, G. waid, OHG. weit, Dan. vaid, veid, Sw. veide, L. vitrum.] [Written also wad, and wade.]
   1913 Webster
   (Bot.) An herbaceous cruciferous plant (Isatis tinctoria) of the family Cruciferae (syn. Brassicaceae). It was formerly cultivated for the blue coloring matter derived from its leaves.  See isatin.
   1913 Webster
   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 It is now superseded by indigo, but is somewhat used with indigo as a ferment in dyeing.
   1913 Webster
   Their bodies . . . painted with woad in sundry figures.
   Milton.
   
   1913 Webster
   Wild woad (Bot.), the weld (Reseda luteola).  See Weld. -- Woad mill, a mill grinding and preparing woad.
   1913 Webster