Lewis & Short

Ĭolcos or Iolcus, i, m., = Ἰωλκός,

  1. I. a town and harbor of Thessaly, in Magnesia, on the Pelasgic Gulf, whence Jason is said to have sailed with the Argonauts, Liv. 44, 13, 4; Hor. Epod. 5, 21; Col. 10, 368; Mel. 2, 3, 4; Plin. 4, 9, 16, § 32.
  2. II. Derivv.
    1. A. Ĭolcĭăcus, a, um, adj., of or belonging to Iolcus, Iolchian: portus, Ov. M. 7, 158: foci, Prop. 2, 1, 56 (54): vota, Verg. Cir. 377.
    2. B. Ĭolci, ōrum, m., = Ἰωλκοί, the Iolchians, Serv. Verg. E. 4, 34.