\Dwale\, n. [OE. dwale, dwole, deception, deadly
nightshade, AS. dwala, dwola, error, doubt; akin to E. dull.
See {Dull}, a.]
1. (Bot.) The deadly nightshade ({Atropa Belladonna}), having
   stupefying qualities.
2. (Her.) The tincture sable or black when blazoned according
   to the fantastic system in which plants are substituted
   for the tinctures.
3. A sleeping potion; an opiate. --Chaucer.