Lewis & Short

Postŭmĭus (erroneously writt. Post-hŭmĭus; v. postumus, under posterus, III. B.), i, m.; Postŭmia, ae, f., name of a Roman gens.

  1. I. Postumius Tubertus, a Roman consul, Liv. 2, 16.
  2. II. Postumia, wife of Sulpicius, Cic. Fam. 4, 2, 1.
  3. III. A Vestal, Liv. 4, 44.
  4. IV. A woman addicted to tippling, Cat. 27, 3.
    Hence,
    1. A. Po-stŭmĭus, a, um, adj., Postumian: lex, Plin. 14, 12, 14, § 88: via, leading towards Genoa, Tac. H. 3, 21.
    2. B. Postŭmĭā-nus, a, um, adj., of or belonging to a Postumius, Postumian: imperia, i. e. of the dictator A. Postumius Tubertus, Gell. 1, 13, 7; Liv. 4, 29: caedes, i. e. of M. Postumius Regillensis, id. 4, 51.