Definition of deadly nightshade noun from the Oxford Advanced Learner's Dictionary

 

deadly nightshade

 noun
noun
BrE BrE//ˌdedli ˈnaɪtʃeɪd//
 
; NAmE NAmE//ˌdedli ˈnaɪtʃeɪd//
 
(also belladonna)[uncountable]
 
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a very poisonous plant with purple flowers and black berries
See the Oxford Advanced American Dictionary entry: deadly nightshade