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From Biology-Online Dictionary | Biology-Online Dictionary
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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.