Lewis Short
(adjective) : dŭumvĭrālis, e, duumviri
* Of or belonging to a duumvir, duumviral.
* Adj.: POTESTATE,Inscr. Fabr. p. 29, 129.— More freq.
* Subst.: duumviralis, is, m., one who has been a auumvir, Dig. 50, 3, 1; Inscr. Orell. 3727; 3816.
Charlton T. Lewis, Charles Short, A Latin Dictionary