1. (Science: botany) The deadly nightshade (Atropa Belladonna), having stupefying qualities.
2. 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.
Origin: oe. Dwale, dwole, deception, deadly nightshade, as. Dwala, dwola, error, doubt; akin to E. Dull. See dull.