Lewis Short
(adjective) : rumpōtĭnus, a, um, rumpus-teneo.
* That serves to support the running vines: genus arbusti Gallici,Col. 5, 7, 1; also arbores,id. 5, 7, 1, § 3.
* Subst.: rumpōtĭnus, i,f., a kind of maple (opulus), Plin. 14, 1, 3, § 12; 24, 19, 112, § 172.
Charlton T. Lewis, Charles Short, A Latin Dictionary