Lewis & Short

ĭn-āresco, ārui, 3, v. inch. n., to become dry in any place, to dry up, become quite dry (post-Aug.).

  1. I. Lit.: in sole, Plin. 26, 8.40, § 66; for which: caenum illitum sole, id. 31, 6, 32, § 61: opus, Vitr. 7, 3: medicamenta, Cels. 5, 17 fin.: fructus ante maturitatem, Col. 4, 24, 3: germina multa cum inaruere, Plin. 27, 11, 71, § 95: nihil facilius quam lacrimas inarescere, Quint. 6, 1, 27.
  2. II. Trop., to dry up, become exhausted: ne (liberalitas) nimia profusione inarescat, Plin. Ep. 2, 4, 4.