dyer's woad

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dyer's woad (countable and uncountable, plural dyer's woads)

1. A plant of species Isatis tinctoria, which is the source of the blue dye woad used in the Middle Ages, before being replaced as source by Indigofera tinctoria.

• (Isatis tinctoria): woad, glastrum, asp of Jerusalem

• indigo

•   dyer's woad on Wikipedia.Wikipedia
•   Isatis tinctoria on Wikispecies.Wikispecies
•   Isatis tinctoria on Wikimedia Commons.Wikimedia Commons