n. In England, the popular name of the Rubus cæsius, a bramble which grows in woods, thickets, hedges, and the borders of fields; the fruit of this plant. The fruit is black, with a bluish dewy bloom, and of an agreeable acid taste.n. In the United States, the popular name of Rubus Canadensis, the low blackberry, a trailing plant which has a large sweet fruit; the fruit of this plant.n.