dewberry UK /ˈdjuː.b(ə.)ɹi/US /ˈduˌbɛɹ.i/ noun4 •Small brambles of the genus Rubus which have stems that trail along the ground. •The purple to black berries of these plants. •European dewberry, Rubus caesius. •American dewberry, species of Rubus sect. Flagellares formsdewberries