Lewis & Short

dŭŏvir, vĭri, and usu. plur. dŭŏvĭri (less correctly dŭumvĭri, Zumpt, Gram. § 124; Krebs, Antibarb. p. 391; in MSS. and Inscr. usu. II. vir, II. viri; but, DVOVIRES, Inscr. Orell. 3808: DVOVIRI, ib. 3886, v. infra), ōrum, m. [du + vir], a Roman board or court consisting of two persons.

  1. I. Perduellionis, an extraordinary criminal court, the duumviri, anciently selected by the kings or the people for each case as it arose; so in the trial of Horatius, Liv. 1, 26; of M. Manlius, id. 6, 20; of C. Rabirius, Cic. Rab. Perd. 4, 12; v. Mommsen, Hist. 1, 204.
  2. II. Sacrorum, the keepers of the Sibylline books, Liv. 3, 10, 7; 5, 13, 6; cf. Dion. Hal. 4, 62 (afterwards decemviri and quindecimviri were elected for this purpose; cf. Liv. 22, 10, 9; Lact. 1, 6, 13); v. Mommsen, Hist. 1, 240.
  3. III. Navales, an extraordinary board created for the purpose of equipping fleets, Liv. 9, 30, 4; id. 40, 18, 8; id. 41, 1, 2 sq.; v. Mommsen, Hist. 1, 531; 4, 136.
  4. IV. Ad aedem faciendam (dedicandam, locandam), the duumviri for building or dedicating a temple, Liv. 7, 28, 5; id. 22, 33, 8.
    In the sing.: duumvir, Liv. 2, 42, 5; id. 35, 41, 8; 40, 34, 5 sq.
  5. V. The highest board of magistrates in the municipia and colonies, Cic. Agr. 2, 34, 93; Caes. B. C. 1, 23; id. ib. 1, 30; Inscr. Orell. 2540: QVINQVENNALES, ib. 3882 sq.: IVRI DICVNDO, ib. 3805 sq.
    In the sing.: DVOVIR, ib. 3813 sq.; 4982; also ib. 3886 (Momms. 1956).
  6. VI. VIIS EXTRA URBEM PURGANDIS, officers who had the charge of the streets of the suburbs of Rome, Tab. Heracl. 1, 50 ed. Göttling.