Answer: woad

AnswerCrossword Clue
WOADBlue dye plant
WOADBlue dye
WOADKin of anil and indigo
WOADPlant yielding blue dye.
WOADBlue dye used by early Britons.
WOADBlue dye.
WOADBlue dye from a plant.
WOADDye plant.
WOADBlue dyestuff
WOADHerb or blue dye
woadthe dye extracted from this plant
woada blue dye