boysenberry Definition
☆ boy·sen·berry (bo̵i′zən ber′ē, bo̵i′sən-)
noun pl. -·ries
a large berry, dark red or almost black when ripe, which is a cross of varieties of raspberry, loganberry, and blackberry
Etymology: after Rudolph Boysen, U.S. horticulturist who developed it (c. 1935)

