Lewis & Short

dĕcemvĭrālis, e, adj. [decemviri], decemviral, of or belonging to the decem viri: leges, i. e. of the Twelve Tables, Liv. 3, 57 fin.; Gell. 20, 1, 3: potestas, Liv. 3, 55; Tac. A. 1, 1: annus, Cic. Rep. 2, 37 invidia, id. Brut. 14, 54; Liv. 3, 42: certaminibus, id. 3, 54: odio, id. 3, 42: ex collegio (sacerdotes), Cic. Verr. 2, 4, 49: pecunia (referring to the decemviri agris dividundis), id. Agr. 1, 5; cf.: auctis, ib. 2, 22, 58.
* Adv., dĕcemvĭrālĭter: loqui, i. e. in the manner of the decemviri stlitibus judicandis, Sid. Ep. 8, 6 med.