Lewis & Short

Ăchĕlōŭs, i, m., Ἀχελῶος.

  1. I. A celebrated river of Middle Greece, which, rising in Pindus, separates Aetolia from Acarnania, and empties into the Ionian Sea, now the Aspropotamo, Mel. 2, 3, 10; Plin. 4, 1, 2 al.
    Hence,
  2. II. The river-god Achelous, Ov. M. 8, 549 sq.; 10, 8 sq.; Prop. 2, 34, 33 al.