Lewis & Short

intĕr-āresco, ĕre, v. inch. n., to become dry, to dry up.

  1. I. Lit., Vitr. 7, 8, 2: animalia sine humoris potestate interarescent, will die off, id. 8 praef. § 3.
  2. II. Trop., to dry up, decay; with exstingui et cadere, Cic. Tusc. 5, 14, 40.