Lewis & Short

Crustŭmĕrĭa, ae, f. (Liv. 2, 19, 2; 3, 42, 3); Crustŭmĕrĭum, ii, n. (Plin. 3, 5, 9, § 68); Crustŭmĕri, ōrum, m. (Verg. A. 7, 631); and Crustŭmĭum, ii, n. (Sil. 8, 367),

  1. I. an ancient town in the country of the Sabines, north-east of Fidenæ later belonging to the Tuscans, now Monte Rotondo; cf. O. Müll. Etrusk. 1, p. 113.
  2. II. Hence,
    1. * A. Crustŭmĕrīnus, a, um, adj., of Crustumeria: secessio, Varr. L. L. 5, § 81 Müll.
    2. B. Crustŭmīnus, a, um, adj., the same: ager, Varr. R. R. 1, 14, 3; Plin. 3, 5, 8, § 52; 3, 5, 9, § 53; cf. campi, Liv. 2, 64, 3: montes, id. 5, 37, 7: tribus, Cic. Balb. 25, 57; id. Planc. 16, 38: pira, Col. 5, 10, 18; 12, 10, 4; cf. the foll.: tribus, Paul. ex Fest. p. 55, 10; cf. O. Müll. above cited.
      In plur.: Crustŭmīni, ōrum, m., the inhabitants of Crustumeria, Liv. 1, 9, 8, and 1, 10, 2 sq.
    3. * C. Crustŭmĭus, a, um, of Crustumeria: pira, Verg. G. 2, 88; cf. the preceding.