Lewis & Short

Ăpŏnus, i, m., = ἄπονος (pain-curing).

  1. I. A warm, medicinal fountain in the vicinity of Padua, now Bagni d’ Albano: Patavinorum aquae calidae, Plin. 2, 103, 106, § 227: Aponi fons, Suet. Tib. 14: Aponi fontes, Mart. 6, 42, 4; Cassiod. Var. 2, 39; cf. Mann. Ital. 1, 91.
    Hence,
  2. II. Ăpŏ-nus, a, um, adj., Aponian: tellus, Mart. 1, 62, 3: Aponinus, dub. in Vop. Firm. Sat. c. 3.