A wild bush with thorns, that produces blackberries. (Cambridge Dictionary)
Any of a genus (Rubus) of usually prickly shrubs of the rose family including the raspberries and blackberries. (Merriam – Webster)
A rough prickly shrub or vine. (Merriam – Webster)
A prickly scrambling shrub of the rose family, especially a blackberry. (Oxford Dictionaries)
Brambles are wild prickly bushes that produce blackberries. (Collins Dictionary)
Any prickly shrub belonging to the genus Rubus, of the rose family. (Dictionary.com)
Bramble. Your Dictionary.
The secret life of the bramble.
Bramble is probably one of the most familiar plants in the Welsh countryside.