Definition of comfrey noun from the Oxford Advanced Learner's Dictionary

 

comfrey

 noun
noun
BrE BrE//ˈkʌmfri//
 
; NAmE NAmE//ˈkʌmfri//
 
[uncountable, countable]
 
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a plant with large leaves covered with small hairs and small bell-shaped flowers Word Origin Middle English: from Anglo-Norman French cumfirie, based on Latin conferva, from confervere ‘heal’ (literally ‘boil together’, referring to the plant's medicinal use).
See the Oxford Advanced American Dictionary entry: comfrey