Superaddo, superáddis, superáddidi, superádditum, pen. corr. superáddere. Virg. Propert. To putte or adde to moreouer. Carmcn superad dere tumulo. Virg.
Lewis and Short: Latin dictionary
sŭpĕr-addo, no perf., dĭtum, 3, v. a., to add over and above, to superadd (poet.; now usu. written separately): tumulo superaddite carmen, Verg. E. 5, 42: laurus superaddita busto, Prop. 2, 13, 33 (3, 5, 17): vitis, Verg. E. 3, 38.