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

 

boysenberry

 noun
noun
BrE BrE//ˈbɔɪznbəri//
 
; NAmE NAmE//ˈbɔɪznberi//
 
(pl. boysenberries) Fruit
 
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a large red fruit like a blackberry. The bush it grows on is also called a boysenberry. See related entries: Fruit Word Origin 1930s: named after Robert Boysen (died 1950), the American horticulturalist who developed it.
See the Oxford Advanced American Dictionary entry: boysenberry