Lewis & Short

ar-rōdo (adr-, Kayser, Jan), rōsi, rōsum, 3, v. a., to gnaw or nibble at, to gnaw (cf.: aduro, accendo, accīdo, adedo al.).

  1. I. Lit.: spartum, quod asellus adrodit, Plin. 35, 11, 40, § 137: mures adrosis clipeis, etc., id. 8, 57, 82, § 221: semina adrosa, id. 11, 30, 36, § 109: sues spirantes a muribus adrosas, id. 11, 37, 85, § 213.
  2. II. Trop.: ut illa ex vepreculis extracta nitedula rem publicam conaretur adrodere, * Cic. Sest. 33, 72: ecclesiasticas caulas, Sid. Ep. 7, 6.