Lewis & Short

rumpōtĭnus, a, um, adj. [rumpus-teneo].

  1. I. That serves to support the running vines: genus arbusti Gallici, Col. 5, 7, 1; also arbores, id. 5, 7, 1, § 3.
  2. II. Subst.: rumpōtĭnus, i,f., a kind of maple (opulus), Plin. 14, 1, 3, § 12; 24, 19, 112, § 172.