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Definition of rhubarb noun from the Oxford Advanced American Dictionary

 

rhubarb

 noun
noun
NAmE//ˈrubɑrb//
 
[uncountable]
 
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the thick red stems of a garden plant, also called rhubarb, that are cooked and eaten as a fruit rhubarb pie
See the Oxford Advanced Learner's Dictionary entry: rhubarb