ˈbȯiz ə n-, ˈbȯis ə n- — see berry noun
Etymology: after Rudolph Boysen fl 1923 American horticulturist, its originator
1. : a very large bramble fruit with a flavor like a raspberry especially valued for canning and preserving
2. : the trailing hybrid bramble that bears boysenberries that was developed in California by hybridization from several blackberries and raspberries