Lewis & Short

aerūgo, ĭnis, f. [aes, as ferrugo from ferrum].

  1. I. Rust of copper: aes Corinthium in aeruginem incidit, * Cic. Tusc. 4, 14; Plin. 15, 8, 8, § 34; 34, 17, 48, § 160.
    1. B. Transf.
      1. 1. The verdigris prepared from the same: Aeruginis quoque magnus usus est, Plin. 34, 11, 26, § 110.
      2. 2. In gen., rust of gold and silver: aerugo eorum (auri et argenti) in testimonium vobis erit, Vulg. Jac. 5, 3.
      3. 3. Poet. (as pars pro toto, and sarcastic.), money, Juv. 13, 60.
  2. II. Trop.
    1. A. Envy, jealousy, ill-will (which seek to consume the possessions of a neighbor, as rust corrodes metals): haec est Aerugo mera, Hor. S. 1, 4, 101: versus tincti viridi aerugine, Mart. 10, 33, 5; 2, 61, 5.
    2. B. Avarice, which cleaves to the mind of man like rust: animos aerugo et cura peculi Cum semel imbuerit, Hor. A. P. 330.