An Etymological Dictionary of the German Language/Annotated/Waid
Waid, masculine, ‘woad, blue dye,’ from the equivalent Middle High German and Old High German weit, masculine; corresponding to the equivalent Dutch weede, Anglo-Saxon wâd, English woad, Gothic *waida- (for which wizdila, ‘woad,’ is found,’ whence Middle Latin guasdium, French guède). From Teutonic is derived the equivalent Romance cognate, Italian guado. Latin vitrum, ‘woad,’ is historically related to the Teutonic cognates, which may be based on pre-Teutonic waitó.