Lewis & Short

ferrūgĭnĕus (ferrūgĭnus, Lucr. 4, 76), a, um, adj. [ferrugo].

  1. I. Of color, of the color of iron-rust, dark-red, dusky, ferruginous: palliolum habeas ferrugineum, nam is colos thalassicust, Plaut. Mil. 4, 4, 43: vela lutea, russa, ferrugina, Lucr. 4, 76: cymba, Verg. A. 6, 303 (= κυανέη, for which: caerulea puppis, id. ib. 6, 410): hyacinthi, id. G. 4, 183: frons anguis, Stat. Th. 1, 600: nemus (inferorum), id. ib. 2, 13; cf.: amictus Plutonis, Claud. Rapt. Pros. 2, 275.
  2. II. Of taste, like iron, ferruginous: sapor fontis, Plin. 31, 2, 8, § 12.