a blackberry that is a cultivated variety of Rubus ursinus of the southwestern U.S.
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British Dictionary definitions for youngberry
a trailing bramble of the southwestern US that is a hybrid of a blackberry and dewberry with large sweet dark purple fruits
the fruit of this plant
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012