Lewis & Short

rōbīgo (rūb-), ĭnis, f. [robus = ruber; formed like aerugo, ferrugo], rust of metals.

  1. I. Lit.: hoc quidem pol e robigine, non e ferro factum est, Plaut. Rud. 5, 2, 13: exesa inveniet scabra robigine pila, Verg. G. 1, 495: salsā laedit robigine ferrum, id. ib. 2, 220; Plin. 7, 15, 13, § 64: non rubigo ulla, non aerugo, id. 33, 3, 19, § 62.
    1. B. Transf.
      1. 1. Rust, blight, mildew, smut, mouldiness, on grain, Varr. L. L. 6, § 16 Müll.; id. R. R. 1, 1, 6; Col. 2, 11, 5; id. Arb. 13; id. poët. 10, 342; Plin. 18, 28, 68, § 275; 18, 28, 69, § 279; Hor. C. 3, 23, 7 al.; cf. Robigus and Robigalia.
      2. 2. The deposit, mould, etc., that collects on millstones, Plin. 36, 18, 30, § 136; on the teeth, Ov. M. 2, 776; 8, 802; id. A. A. 1, 515; an ulcer in a wound, Calp. Ecl. 5, 76; a sore, ulcer, produced by lewdness, Varr. ap. Serv. Verg. G. 1, 151.
  2. II. Trop., rust (poet. and in post-Aug. prose): ingenium longa rubigine laesum Torpet, Ov. Tr. 5, 12, 21: animorum, Sen. Ep. 95, 36; 7, 7: horridae vetustatis, Val. Max. 2, 9, 5.
    As personified, v. Robigus fin.